Immunomodulating polynucleotides, antibody conjugates thereof, and methods of their use

ABSTRACT

Immunomodulating polynucleotides are disclosed. The immunomodulating polynucleotides may contain 5-modified uridine, 5-modified cytidine, a total of from 6 to 16 nucleotides, and/or one or more abasic spacers and/or internucleoside phosphotriesters. Also disclosed are conjugates containing a targeting moiety and one or more immunomodulating polynucleotides. The immunomodulating polynucleotides and conjugates may further contain one or more auxiliary moieties. Also disclosed are compositions containing the immunomodulating polynucleotides or the conjugates containing one or more stereochemically enriched internucleoside phosphorothioates. Further disclosed are pharmaceutical compositions containing the immunomodulating polynucleotides or the conjugates and methods of their use.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application Nos. 62/485,748 and 62/537,925, filed April 14 and Jul. 27, 2017, respectively; the disclosure of each of which is incorporated herein by reference in its entirety.

REFERENCE TO A SEQUENCE LISTING

This application is being filed with a computer readable form (CRF) copy of a Sequence Listing named 14465-001-999_ST25.txt, created on Apr. 11, 2018, and being 116,262 bytes in size; which is incorporated herein by reference in its entirety.

FIELD OF THE INVENTION

This invention relates to compositions and methods for modulating the immune system response. Provided herein is an immunomodulating polynucleotide. Also provided herein is an immunomodulating polynucleotide comprising a 5-modified uridine or a 5-modified cytidine and having a length ranging from about 6 to about 16 nucleotides. Further provided herein is a conjugate comprising a targeting moiety and one or more immunomodulating polynucleotides. Provided herein is a pharmaceutical composition comprising an immunomodulating polynucleotide or a conjugate comprising a targeting moiety and one or more immunomodulating polynucleotides. Provided herein are methods of their use for treating a disease, such as cancer.

BACKGROUND

Pathogen-associated molecular patterns (PAMPs) are molecules associated with various pathogens and are recognized by toll-like receptors (TLRs) and other pattern recognition receptors (PRRs) activating innate immune responses. The ability of PAMPs to recruit immune system in the absence of pathogens provides a strategy for treating a variety of diseases involving cell destruction (e.g., anticancer therapy) through the use of innate immune system response. One class of PAMPs that has been investigated for a variety of therapeutic applications is immunostimulating polynucleotides, such as CpG ODN (e.g., agatolimod). It is thought that CpG ODNs mediate TLR9 dimerization in immune cells (e.g., B cells, monocytes, and plasmacytoid dendritic cells (pDCs)) to upregulate cytokines (e.g., type I interferon and interleukins), thereby activating natural killer cells.

CpG ODNs are generally divided into three classes: class A, class B, and class C. Class A CpG ODNs typically contain poly-G tails with phosphorothioate backbones at 3′- and 5′-termini and a central palindromic sequence including a phosphate backbone. Class A CpG ODNs typically contain CpG within the central palindrome sequence. Class B CpG ODNs typically include fully phosphorothioate backbone, and the sequence at the 5′ end of class B CpG ODN is often critical for TLR9 activation. Class C CpG ODNs include fully phosphorothioate backbone with a 3′-end sequence enabling formation of a duplex. CpG ODNs are often susceptible to degradation in serum. Thus, pharmacokinetics of CpG ODNs may be one of the limiting factors in their development as therapeutics. Further, CpG ODNs often exhibit uneven tissue distribution in vivo, with primary sites of accumulation being in liver, kidney, and spleen. Such distribution can elicit off-target activity and local toxicity associated with PAMPs. Thus, therapeutic applications of CpG ODNs may be facilitated by addressing the pharmacokinetic/pharmacodynamic challenges described herein.

Accordingly, there is a need for new immunomodulating polynucleotides.

SUMMARY OF THE INVENTION

In general, the present invention relates to immunomodulating (e.g., immunostimulating) polynucleotides and conjugates containing a targeting moiety and one or more immunomodulating (e.g., immunostimulating) polynucleotides.

In one aspect, disclosed are immunomodulating polynucleotides. The immunomodulating polynucleotide may be an immunostimulating polynucleotide. Alternatively, the immunomodulating polynucleotide may be an immunosuppressive polynucleotide.

In some embodiments, the immunomodulating polynucleotide contains one or more (e.g., 1 or 2) abasic spacers or phosphotriesters. In particular embodiments, the immunomodulating polynucleotide contains one or more (e.g., 1 to 5) internucleoside phosphotriesters. In further embodiments, at least one of the internucleoside phosphotriesters contains a conjugating group. In yet further embodiments, the immunomodulating polynucleotide further contains a terminal phosphoester (e.g., a 5′-terminal phosphoester or 3′-terminal phosphoester). In still further embodiments, the terminal phosphoester contains a conjugating group. In other embodiments, the immunomodulating polynucleotide includes a 5′-cap or 3′-cap. In yet other embodiments, the immunomodulating polynucleotide contains the 5′-cap that is a 5′-5′ cap. In still other embodiments, the 5′-5′ cap contains a conjugating group covalently bonded to an internucleoside phosphate, internucleoside phosphorothioate, or internucleoside phosphorodithioate. In some embodiments, the immunomodulating polynucleotide includes the 3′-cap containing a conjugating group covalently bonded to an internucleoside phosphate, internucleoside phosphorothioate, or internucleoside phosphorodithioate.

In further embodiments, the immunomodulating polynucleotide contains a 5′-capping group that is monophosphate, diphosphate, triphosphate, an auxiliary moiety, a terminal phosphodiester, a terminal phosphotriester, a 5′-5′ cap, or a group —OR′, where R′ is a bioreversible group, a non-bioreversible group, or an O-protecting group. In yet further embodiments, the 5′-capping group is monophosphate or the terminal phosphodiester including optionally substituted C₁₋₆ alkyl bonded to phosphate, phosphorothioate, or phosphorodithioate. In still further embodiments, the immunomodulating polynucleotide contains a 3′-capping group that is monophosphate, diphosphate, triphosphate, an auxiliary moiety, a terminal phosphodiester, a terminal phosphotriester, and a group —OR′, where R′ is a bioreversible group, a non-bioreversible group, or an O-protecting group. In some embodiments, the 3′-capping group is monophosphate or the terminal phosphodiester comprising optionally substituted C₁₋₆ alkyl bonded to phosphate, phosphorothioate, or phosphorodithioate.

In particular embodiments, the immunomodulating polynucleotide contains one or more (e.g., 1 or 2) abasic spacers. In further embodiments, at least one of the abasic spacers is an internucleoside abasic spacer. In yet further embodiments, at least one of the abasic spacers is a 3′-terminal abasic spacer. In still further embodiments, at least one of the abasic spacers comprises a conjugating group.

In certain embodiments, the immunomodulating polynucleotide contains a 5-modified uridine (e.g., 5-halouridine (e.g., 5-bromouridine or 5-iodouridine) or 5-modified cytidine). In further embodiments, the 5-modified uridine (e.g., 5-halouridine (e.g., 5-bromouridine or 5-iodouridine)) is at least one of two 5′-terminal nucleosides or is present in an immunostimulating sequence (ISS) in the immunomodulating polynucleotide. In yet further embodiments, the 5-modified uridine (e.g., 5-halouridine) includes a 3′-position bonded to an internucleoside phosphodiester phosphate. In certain embodiments, the 5-modified uridine (e.g., 5-halouridine) includes a 3′-position bonded to an internucleoside phosphodiester phosphorothioate. In still further embodiments, the 5-modified uridine (e.g., 5-halouridine) is 5′-terminal. In some embodiments, the 5-modified uridine is 5-bromouridine. In particular embodiments, the immunomodulating polynucleotide contains cytidine and guanosine as the second and third nucleosides or as the third and fourth nucleosides.

In particular embodiments, the immunomodulating polynucleotide contains a 5′-terminal immunostimulating sequence. In certain embodiments, at least one of the internucleoside phosphotriesters is bonded to a 3′-carbon atom of a nucleoside having a 5′-carbon atom which is bonded to a 5′-terminal immunostimulating sequence.

In further embodiments, the immunomodulating polynucleotide comprises a total of from 6 to 16 (e.g., 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) nucleotides. In yet further embodiments, at least 10% (e.g., at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, or at least 90%) of internucleoside bridging groups in the immunomodulating polynucleotide contain phosphorothioates. In still further embodiments, at least 50% of internucleoside bridging groups in the immunomodulating polynucleotide contain phosphorothioates.

In some embodiments, the immunomodulating polynucleotide includes a conjugating group covalently bonded to a nucleobase in the immunomodulating polynucleotide.

In certain embodiments, the immunomodulating polynucleotide includes one or more auxiliary moieties. In particular embodiments, the immunomodulating polynucleotide includes a conjugating moiety containing at least one of the auxiliary moieties. In some embodiments, at least of the one auxiliary moieties contains a polyethylene glycol) (PEG) having a molecular weight of from 100 Da to 2,500 Da. In further embodiments, each PEG contains independently a total of at least 3 ethylene glycol repeating units. In yet further embodiments, each PEG contains independently a total of at least 20 ethylene glycol repeating units. In still further embodiments, each PEG contains independently a total of 50 or fewer ethylene glycol repairing units. In other embodiments, the immunomodulating polynucleotide contains from one to eight PEGs.

In particular embodiments, the immunomodulating polynucleotide is a polynucleotide disclosed herein (e.g., in Table 2).

In another aspect, disclosed are hybridized immunomodulating polynucleotides containing an immunomodulating polynucleotide hybridized to a complementary polynucleotide.

In yet another aspect, disclosed are compositions containing an immunomodulating polynucleotide, in which the immunomodulating polynucleotide contains at least one stereochemically enriched internucleoside phosphorothioate.

In some embodiments, at least one stereochemically enriched internucleoside phosphorothioate is disposed between a 5′-terminal nucleoside and cytidine of CpG in an immunostimulating sequence in the immunomodulating polynucleotide. In further embodiments, one stereochemically enriched internucleoside phosphorothioate connects the first and the second nucleosides in the immunomodulating polynucleotide. In yet further embodiments, one stereochemically enriched internucleoside phosphorothioate is bonded to 5′-carbon atom of cytidine of CpG in an immunostimulating sequence in the immunomodulating polynucleotide. In still further embodiments, one stereochemically enriched internucleoside phosphorothioate connects the fourth and the fifth nucleosides in the immunomodulating polynucleotide. In certain embodiments, the stereochemically enriched internucleoside phosphorothioate is S-stereogenic. In particular embodiments, the stereochemically enriched internucleoside phosphorothioate is R-stereogenic.

In still another aspect, disclosed are conjugates containing a targeting moiety and one or more immunomodulating polynucleotides.

In some embodiments, the targeting moiety is an antigen-binding moiety, a polypeptide, an aptamer, or a group including one or more small molecules. In certain embodiments, the targeting moiety is an antigen-binding moiety (e.g., an antibody or an antigen-binding fragment thereof). In further embodiments, the antibody or the antibody fragment includes an N-terminal or C-terminal Q-tag, where the immunomodulating polynucleotide(s) are independently covalently bonded to the N-terminal or C-terminal Q-tag. In yet further embodiments, the Q-tag is disposed in a heavy chain or light chain of the antibody or the antibody fragment.

In particular embodiments, the immunomodulating polynucleotide is as disclosed in other aspects.

In certain embodiments, at least one of the immunomodulating polynucleotides contains a 5-modified uridine or 5-modified cytidine. In further embodiments, at least one of the immunomodulating polynucleotides comprises a 5-modified uridine that is 5-halouridine, 5-alkynyluridine, or 5-heterocyclyluridine. In yet further embodiments, the 5-modified uridine is 5-halouridine (e.g., 5-bromouridine or 5-iodouridine). In some embodiments, the 5-modified uridine is one of two 5′-terminal nucleotides of at least one of the immunomodulating polynucleotides. In other embodiments, the 5-modified uridine comprises a 3′-position bonded to an internucleoside phosphoester phosphate. In yet other embodiments, the 5-modified uridine comprises a 3′-position bonded to an internucleoside phosphoester phosphorothioate. In still other embodiments, at least one of the immunomodulating polynucleotides contains cytidine and guanosine as the second and third nucleosides. In particular embodiments, at least one of the immunomodulating polynucleotides contains cytidine and guanosine as the third and fourth nucleosides.

In some embodiments, at least one of the immunomodulating polynucleotides contains a total of from 6 to 16 (e.g., 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16) nucleotides.

In further embodiments, at least one of the immunomodulating polynucleotides contains one or more abasic spacers or internucleoside phosphotriesters. In yet further embodiments, at least one abasic spacer or at least one phosphotriester contains the linker.

In particular embodiments, at least one of the immunomodulating polynucleotides contains one or more (e.g., 1 or 2) abasic spacers. In other embodiments, at least one of the abasic spacers is an internucleoside abasic spacer. In yet other embodiments, at least one of the abasic spacers is a 3′-terminal abasic spacer.

In certain embodiments, at least one of the immunomodulating polynucleotides contains one or more (e.g., 1 to 5) internucleoside phosphotriesters.

In some embodiments, the conjugate further contains one or more auxiliary moieties bonded to the linker. In further embodiments, at least of the one auxiliary moieties contains a polyethylene glycol) (PEG) having a molecular weight of from 100 Da to 2,500 Da. In yet further embodiments, each PEG independently contains a total of at least 3 (e.g., at least 5, at least 6, at least, 7 at least 8, at least 9, at least 10, at least 12, at least 14, at least 16, at least 18, or at least 20) ethylene glycol repeating units. In still further embodiments, each PEG independently contains a total of 50 or fewer (e.g., 45 or fewer, 40 or fewer, 35 or fewer, or 30 or fewer) ethylene glycol repearing units. In certain embodiments, the conjugate contains from one to eight PEGs.

In particular embodiments, a 5′-capping group in at least one of the immunomodulating polynucleotides is monophosphate, diphosphate, triphosphate, an auxiliary moiety, a terminal phosphodiester, a terminal phosphotriester, or a group-OR′, where R′ is a bioreversible group, a non-bioreversible group, or an O-protecting group. In further embodiments, the 5′-capping group is monophosphate or the terminal phosphodiester containing optionally substituted C₁₋₆ alkyl bonded to phosphate, phosphorothioate, or phosphorodithioate. In yet further embodiments, the 3′-capping group in at least one of the immunomodulating polynucleotides is monophosphate, diphosphate, triphosphate, an auxiliary moiety, a terminal phosphodiester, a terminal phosphotriester, or a group —OR′, where R′ is a bioreversible group, a non-bioreversible group, or an O-protecting group. In other embodiments, the 3′-capping group is monophosphate or the terminal phosphodiester containing optionally substituted C₁₋₆ alkyl bonded to phosphate, phosphorothioate, or phosphorodithioate.

In certain embodiments, at least one of immunomodulating polynucleotides contains a nucleobase bonded to the linker.

In further embodiments, the conjugate contains from one to six (e.g., 1 to 4) immunomodulating polynucleotides. In yet further embodiments, the conjugate contains only one immunomodulating polynucleotide. In still further embodiments, the conjugate contains only two immunomodulating polynucleotides. In other embodiments, the conjugate contains one targeting moiety.

In some embodiments, the immunomodulating polynucleotide contains a human immunostimulating sequence within four 5′-terminal nucleotides. In certain embodiments, the human immunostimulating sequence within four 5′-terminal nucleotides of the immunomodulating polynucleotide includes cytidine containing a 5′-carbon atom bonded to a phosphoester substituted with a nucleoside.

In particular embodiments, at least one of the immunomodulating polynucleotides contains a 5-modified uridine or 5-modified cytidine.

In certain embodiments, at least one of the immunomodulating polynucleotides is hybridized to its complement.

In further embodiments, at least one of the immunomodulating polynucleotides contains at least one stereochemically enriched internucleoside phosphorothioate.

In a further aspect, disclosed are compositions containing a conjugate including a targeting moiety and one or more immunomodulating polynucleotides, each of the immunomodulating polynucleotides including independently a linker, where the targeting moiety is covalently bonded to the linker, and at least one of the immunomodulating polynucleotides containing at least one stereochemically enriched internucleoside phosphorothioate.

In some embodiments, at least one stereochemically enriched internucleoside phosphorothioate is disposed between a 5′-terminal nucleoside and cytidine of CpG in an immunostimulating sequence in the immunomodulating polynucleotide. In certain embodiments, at least one stereochemically enriched internucleoside phosphorothioate is bonded to 5′-carbon atom of cytidine of CpG in an immunostimulating sequence in the immunomodulating polynucleotide. In particular embodiments, at least one stereochemically enriched internucleoside phosphorothioate connects the first and the second nucleosides in the immunomodulating polynucleotide. In further embodiments, at least one stereochemically enriched internucleoside phosphorothioate connects the fourth and the fifth nucleosides in the immunomodulating polynucleotide. In yet further embodiments, the stereochemically enriched internucleoside phosphorothioate is S-stereogenic. In still further embodiments, the stereochemically enriched internucleoside phosphorothioate is R-stereogenic.

In yet further aspect, disclosed are pharmaceutical compositions containing a pharmaceutically acceptable carrier and the immunomodulating polynucleotide of invention, the stereochemically enriched composition of the invention, or the conjugate of the invention.

In still further aspect, disclosed are methods of modulating an endosomal toll-like receptor in a cell comprising the endosomal toll-like receptor by contacting the cell with the immunomodulating polynucleotide of the invention, the composition of the invention, the conjugate of the invention, or the pharmaceutical composition of the invention under conditions permitting the immunomodulating polynucleotides to be transported into the cell, where, after the contacting, the activity of the endosomal toll-like receptor is modulated.

In some embodiments, the immunomodulating polynucleotide is an immunostimulating polynucleotide, and the method is for agonizing an endosomal toll-like receptor.

In particular embodiments, the immunomodulating polynucleotide is an immunosuppressive polynucleotide, and the method is for antagonizing an endosomal toll-like receptor.

In another aspect, disclosed are methods of inducing one or more cytokines in an antigen-presenting cell containing an endosomal toll-like receptor by contacting the antigen-presenting cell with the immunomodulating polynucleotide of the invention, the composition of the invention, the conjugate of the invention, or the pharmaceutical composition of the invention under conditions permitting the one or more immunomodulating polynucleotides to be transported into the cell, where, after the contacting, the level of at least one cytokine in the cell is increased, where the targeting moiety targets the antigen-presenting cell, and where the immunomodulating polynucleotide is an immunostimulating polynucleotide.

In some embodiments, the antigen-presenting cell is a B cell. In certain embodiments, at least one of the one or more cytokines is an inflammatory cytokine. In particular embodiments, the antigen-presenting cell is a plasmacytoid dendritic cell, and where the targeting moiety targets the plasmacytoid dendritic cell. In certain embodiments, the antigen-presenting cell is a macrophage. In further embodiments, at least one of the cytokines is a type I interferon. In yet further embodiments, the toll-like receptor is TLR9.

In yet another aspect, disclosed are methods of treating a liquid tumor in a patient by administering to the patient an effective amount of the immunomodulating polynucleotide of the invention, the composition of the invention, the conjugate of the invention, or the pharmaceutical composition of the invention, where the targeting moiety targets B cells, and where the immunomodulating polynucleotide is an immunostimulating polynucleotide that is a TLR9 agonist.

In certain embodiments, the liquid tumor is a hematologic tumor (e.g., the hematologic tumor is a lymphoma). In particular embodiments, the lymphoma is a non-Hodgkin B-cell lymphoma. In further embodiments, the lymphoma is mantle cell lymphoma, diffuse large B cell lymphoma, follicular lymphoma, chronic lymphocytic leukemia, or multiple myeloma.

In still another aspect, disclosed are methods of treating a solid tumor in a patient by administering to the patient the immunomodulating polynucleotide of the invention, the composition of the invention, the conjugate of the invention, or the pharmaceutical composition of the invention, where the targeting moiety targets plasmacytoid dendritic cells, and where the immunomodulating polynucleotide is an immunostimulating polynucleotide that is a TLR9 agonist. In some embodiments, the method for treating a solid tumor in a patient comprises administering to the patient an immunomodulating polynucleotide as disclosed herein, wherein the immunomodulating polynucleotide targets B cell in the patient.

It is to be understood that the present invention also provides uses of the immunomodulating polynucleotides of the invention, conjugates of the invention, compositions of the invention, or pharmaceutical compositions of the invention in the manufacture of products (e.g., medicaments) for the purposes described herein (e.g., for treating a liquid or solid tumor in a patient). It is also to be understood that the present invention also provides uses of the immunomodulating polynucleotides of the invention, conjugates of the invention, compositions of the invention, or pharmaceutical compositions of the invention for the purposes described herein (e.g., for treating a liquid or solid tumor in a patient). Further, it is to be understood that the present invention also provides the immunomodulating polynucleotides of the invention, conjugates of the invention, compositions of the invention, or pharmaceutical compositions of the invention for use according to the purposes described herein (e.g., for treating a liquid or solid tumor in a patient).

In any aspect of the invention, the linker can be as disclosed herein (e.g., according to any one of formulae (II), (V), and (VI)-(XV)). In any aspect of the invention, the conjugating group can be as disclosed herein.

Provided herein is an oligonucleotide of Formula (A): X^(5′)—(X^(N))_(b)—Y^(P)—(X^(N))_(c)—X^(3′)  (A) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

each X^(N) is independently a nucleotide;

X^(3′) is a 3′ terminal nucleotide;

X^(5′) is a 5′ terminal nucleotide;

Y^(P) is an internucleoside phosphotriester; and

b and c are each an integer ranging from about 0 to about 25; with the proviso that their sum is no less than 5;

wherein the oligonucleotide comprises a nucleotide with a modified nucleobase.

Also provided herein is an oligonucleotide having a sequence of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T (SEQ ID NO: 497), or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

x is an integer ranging from 1 to 4;

N¹ is absent or 2′-deoxythymidine;

N² is a 2′-deoxyribonucleotide with a modified nucleobase;

N³ is 2′-deoxyadenosine or 2′-deoxythymidine, each optionally comprising a 3′-phosphotriester;

N⁴ is 2′-deoxyadenosine or 2′-deoxythymidine; and

N⁵ is 2′-deoxythymidine optionally comprising a 3′-phosphotriester.

Additionally provided herein is a compound of Formula (B): R^(x)-L^(N)-(Q)_(e)  (B) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

R^(x) is a conjugating group;

L^(N) is a linker;

each Q is independently an oligonucleotide comprising a phosphotriester; and

e is an integer of 1, 2, 3, or 4.

Further provided herein is a compound of Formula (C): Ab

L^(N)-(Q)_(e)]_(f)  (C) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

Ab is an antibody;

each L^(N) is independently a linker;

each Q is independently an oligonucleotide comprising a phosphotriester;

each e is independently an integer of 1, 2, 3, or 4; and

f is an integer of 1, 2, 3, or 4.

In one aspect, provided herein are methods for treating cancer in a subject having cancer, comprising administering a therapeutically effective amount of a CpG-Ab immunoconjugate to the subject, wherein the CpG-Ab immunoconjugate does not bind to a tumor associated antigen (TAA). In some embodiments, the CpG-Ab immunoconjugate specifically binds to a target antigen associated with a normal immune cell that expresses at least one toll-like receptor. In some embodiments, the normal immune cell expresses TLR9. In some embodiments, the normal immune cell is an antigen presenting cell (APC). In some embodiments, the APC is a B cell, a dendritic cells or a macrophage. In some embodiments, the target antigen is selected from the group consisting of a MHC molecule, a T cell costimulatory molecule, an immune checkpoint molecule, a B cell specific antigen, a dendritic cell specific antigen and a macrophage specific antigen. In some embodiments, the MHC molecule is selected from MHC class I and MHC class II molecules. In some embodiments, the T cell costimulatory molecule is selected from the list consisting of OX40, CD2, CD27, CDS, ICAM-1, LFA-1/CD11a/CD18, ICOS/CD278, 4-1BB/CD137, GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3, and CD83. In some embodiments, the immune checkpoint molecule is selected from the list consisting of PD-1, PD-L1, PD-L2, TIM-1, TIM-3, LAG-3, CEACAM-1, CEACAM-5, CLTA-4, VISTA, BTLA, TIGIT, LAIR1, CD47, CD160, 2B4, CD172a, and TGFβ. In some embodiments, target antigen is selected from the group consisting of CD1, CD2, CD3, CD5, CD6, CD9, CD11, CD14, CD17, CD18, CD19, CD20, CD21, CD22, CD23, CD24, CD25, CD26, CD27, CD30, CD32, CD37, CD38, CD39, CD40, CD44, CD45R (B220), CD49, CD52, CD55, CD56, CD64, CD66 (Carcinoembrionic antigen, CEA), CD68, CD70, CD74, CD79b, CD80, CD93, CD115, CD123, CD126, CD127, CD137, CD138, CD163, CD196, CD197, CD200R, CD205, CD206, CD207, CD208, CD209, CD267, CD269, CD274, CD300a, CD301, CD303, CD304, CD319, CD336, CLEC5a, CLEC6, CLEC9a, CXCL16, CX3CR1, and DC-STAMP. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from Table 2. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from the group consisting of p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489. In some embodiments, the CpG-Ab immunoconjugates is not conjugated to a T cell epitope. In some embodiments, the T cell epitope is an epitope of ovalbumin (OVA). In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of treating cancer in a subject having cancer, comprises administering a therapeutically effective amount of a CpG-Ab immunoconjugate to the subject, wherein the CpG-Ab immunoconjugate specifically binds to a tumor associated antigen (TAA), wherein the TAA is not an antigen selected from the group consisting of CD19, CD20, CD22, exportin 7, Her2, Src, EGFR, CD52, CXCR-4, Muc-1 and DNA. In some embodiments, binding of the CpG-Ab immunoconjugate to the TAA facilitates internalization of the CpG-Ab immunoconjugate into a cancer cell expressing the TAA. In some embodiments, binding of the CpG-Ab immunoconjugate to the TAA facilitates transportation of the CpG-Ab immunoconjugate to endosome of the cancer cell expressing the TAA. In some embodiments, binding of the CpG-Ab immunoconjugate to the TAA facilitates activation of a TLR9 signaling pathway in a cancer cell expressing the TAA. In some embodiments, the TAA and the TLR9 are located on a same cellular membrane of the cancer cell expressing the TAA. In some embodiments, both the TAA and the TLR9 are located on the cell membrane of the cancer cell expressing the TAA. In some embodiments, both the TAA and the TLR9 are located on the endosomal membrane of the cancer cell expressing the TAA. In some embodiments, binding of the CpG-Ab immunoconjugate to the TAA induces apoptosis of the cancer cell expressing the TAA. In some embodiments, the TAA is not expressed by a normal immune cell. In some embodiments, the TAA is expressed by a normal immune cell. In some embodiments, the normal immune cell is an antigen presenting cell (APC). In some embodiments, the TAA is selected from the group consisting of CD8, CD11 b, CD11c, CD14, CD33, CD40, CD123, CD157, CD168, CD169, CD172a, CD200, CD204, CD205, CD301, CD302, CD303, CD304, and CD206. In some embodiments, the CpG-Ab immunoconjugate is not conjugated to the TAA or any other TAA expressed by the cancer. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from Table 2. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from the group consisting of p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489. In some embodiments, the CpG-Ab immunoconjugate is not conjugated to a T cell epitope. In some embodiments, the T cell epitope is ovalbumin (OVA). In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of treating an immunotherapy resistant or refractory cancer in a subject having immunotherapy resistant or refractory cancer, comprising administering a therapeutically effective amount of a CpG-Ab immunoconjugate to the subject. In some embodiments, the CpG-Ab immunoconjugate does not bind to a tumor associated antigen. In some embodiments, the CpG-Ab immunoconjugate specifically binds to a target antigen associated with a normal immune cell that expresses at least one toll-like receptor. In some embodiments, the CpG-Ab immunoconjugate specifically binds to a tumor associated antigen. In some embodiments, the cancer is resistant to treatment with an immune checkpoint modulator. In some embodiments, the method further comprising co-administering to the subject the immune checkpoint modulator. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from Table 2. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from the group consisting of p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489 as shown in Table 2. In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of preventing cancer in a subject in need thereof, comprising administering a therapeutically effective amount of a CpG-Ab immunoconjugate to the subject, wherein the CpG-Ab immunoconjugate specifically binds to a target antigen associated with a normal immune cell expressing at least one toll-like receptor. In some embodiments, such method further comprises co-administering a tumor associated antigen with the CpG-Ab immunoconjugate. In some embodiments, the CpG-Ab immunoconjugate is not conjugated to the tumor associated antigen. In some embodiments, the normal immune cell expresses TLR9. In some embodiments, the normal immune cell is an antigen presenting cell (APC). In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from Table 2. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from the group consisting of p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489 as shown in Table 2. In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of preventing cancer in a subject in need thereof, comprising co-administering a therapeutic effective amount of a CpG-Ab immunoconjugate with a cancer vaccine, wherein the CpG-Ab immunoconjugate specifically binds to a target antigen associated with a normal immune cell expressing at least one toll-like receptor. In some embodiments, the CpG-Ab immunoconjugate is formulated as an adjuvant of the cancer vaccine. In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of inducing an adaptive immune response in a subject, comprising administering a therapeutically effective amount of a CpG-Ab immunoconjugate to the subject, wherein the CpG-Ab immunoconjugate specifically binds to a target antigen associated with a normal immune cell expressing at least one toll-like receptor. In some embodiments, the subject has cancer. In some embodiments, the target antigen is not a TAA. In some embodiments, the target antigen is a TAA that is not an antigen selected from the group consisting of CD19, CD20, CD22, STAT3, exportin 7, Her2, Src, EGFR, CD52, CXCR-4, Muc-1 and DNA. In some embodiments, the subject has an infectious disease. In some embodiments, the normal immune cell expresses TLR9. In some embodiments, the normal immune cell is an antigen presenting cell (APC). In some embodiments, the adaptive immune response is CD8+ T cell dependent. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from Table 2. In some embodiments, the CpG-Ab immunoconjugates comprises an immunostimulating polynucleotide selected from the group consisting of p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489 as shown in Table 2. In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments, provided herein are methods of treating cancer in a subject having cancer, comprising administering to the subject a therapeutic effective amount of a CpG-Ab immunoconjugates selected from Table 6. In some embodiments, the CpG-Ab immunoconjugates binds to a tumor associated antigen (TAA). In some embodiments, the CpG-Ab immunoconjugates binds to a target antigen other than the TAA. In some embodiments, the CpG-Ab immunoconjugates binds to the target antigen associated with a normal immune cell expressing a TLR receptor. In some embodiments, the CpG-Ab immunoconjugates is selected from the group consisting of CpG-Ab immunoconjugates comprisingp 236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489 as shown in Table 2. In some embodiments, further comprising co-administering a therapeutic effective amount of at least one additional cancer therapeutic agent. In some embodiments, the at least one additional cancer therapeutic agent is selected from a second TAA, a T cell costimulatory molecule, and an immune checkpoint modulator. In some embodiments, the second TAA is the same as the TAA. In some embodiments, the second TAA is different from the TAA. In some embodiments, the T cell costimulatory molecule is selected from the list consisting of OX40, CD2, CD27, CDS, ICAM-1, LFA-1/CD11a/CD18, ICOS/CD278, 4-1BB/CD137, GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3, and CD83 or an ligand thereof. In some embodiments, the T cell costimulatory molecule is an anti-OX40 antibody, anti-ICOS/CD278 antibody or anti-4-1 BB/CD137 antibody, or an antigen-binding fragment thereof. In some embodiments, wherein the immune checkpoint modulator is an inhibitor of immune checkpoint molecules selected from the list consisting of PD-1, PD-L1, PD-L2, TIM-3, LAG-3, CEACAM-1, CEACAM-5, CLTA-4, VISTA, BTLA, TIGIT, LAIR1, CD47, CD160, 2B4, CD172a, and TGFR. In some embodiments, the immune checkpoint modulator is an anti-CD47 antibody, anti-PD-1 antibody, anti-PD-L1 antibody, or an antigen-binding fragment thereof. In some embodiments, the cancer is a solid tumor. In some embodiments the cancer is a liquid tumor. In some embodiments of the methods provided herein, the cancer is recurrent cancer. In some embodiments of the methods provided herein, the administering or co-administering is through systemic administration. In some embodiments of the methods provided herein, the therapeutic effective amount of the CpG-Ab immunoconjugate is not effective to activate the complement pathway in the subject. In some embodiments of the methods provided herein, the amount is not effective to activate complement C3 in the subject.

In some embodiments of any of the methods provided herein, wherein the CpG-Ab immunoconjugate comprises an oligonucleotide of Formula (A) as defined above. In some embodiments of any of the methods provided herein, wherein the CpG-Ab immunoconjugate comprises a compound of Formula (B) as defined above. In some embodiments of any of the methods provided herein, wherein the CpG-Ab immunoconjugate is a compound of Formula (C) as defined above.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a series of structures showing abbreviations with corresponding structures. The abbreviations are those used in Table 2.

FIG. 1B is a series of structures showing abbreviations with corresponding structures. The abbreviations are those used in Table 2.

FIG. 2 is an image of an ethidium bromide-stained denaturing gel of single-stranded CpG ODNs (lanes A (p145) and D (p88)) and annealed double-stranded CpG ODNs (lanes B (p88/p144) and C (p88/p145)).

FIG. 3A is an image of ethidium bromide-stained reducing gels of a Q-tagged anti-CD38 antibody before (lane A) and after mouse transglutaminase-mediated conjugation with a polynucleotide (p76, p77, p78, p79, p80, p81, and p82 corresponding to lanes B, C, D, E, F, G, and H, respectively. HC+1 indicates bands of a Q-tagged anti-CD38 antibody heavy chain conjugated to a polynucleotide. HC indicates bands of a Q-tagged anti-CD38 antibody heavy chain. LC indicates an anti-CD38 antibody light chain.

FIG. 3B is an image of ethidium bromide-stained reducing gels of a Q-tagged anti-CD38 antibody before (lane A) and after microbial transglutaminase-mediated conjugation with a polynucleotide p83, p84, p85, p86, p87, and p88 corresponding to lanes B, C, D, E, F, and G, respectively. HC+1 indicates bands of a Q-tagged anti-CD38 antibody heavy chain conjugated to a polynucleotide. HC indicates bands of a Q-tagged anti-CD38 antibody heavy chain. LC indicates an anti-CD38 antibody light chain.

FIG. 4A is an image of an ethidium bromide-stained denaturing gel of a Q-tagged anti-CD38 conjugated to an azide linker before (lane A) and after conjugation through dipolar cycloaddition to a single-stranded polynucleotide (lane B, a Dari conjugate with p88) or to a double-stranded polynucleotide (lanes C, D, E, and F). Lane C corresponds to the isolated first AEX peak for the conjugate of Q-tagged anti-CD38 antibody linked by a metal-free 1,3-dipolar cycloaddition to p88/p145 double-stranded CpG. Lane D corresponds to the isolated second AEX peak for the conjugate of Q-tagged anti-CD38 antibody linked by a metal-free 1,3-dipolar cycloaddition to p88/p145 double-stranded CpG. Lane E corresponds to the isolated first AEX peak for the conjugate of Q-tagged anti-CD38 antibody linked by a metal-free 1,3-dipolar cycloaddition to p88/p144 double-stranded CpG. Lane F corresponds to the isolated second AEX peak for the conjugate of Q-tagged anti-CD38 antibody linked by a metal-free 1,3-dipolar cycloaddition to p88/p144 double-stranded CpG.

FIG. 4B is a graph showing AEX-HPLC traces for a crude mixture containing rituximab-p19 conjugate showing signals based on absorbance at 280 nm and at 260 nm. There are three peaks corresponding to rituximab-p19 conjugate.

FIG. 4C is a graph showing a composite of AEX-HPLC traces for: the crude mixture, p19, and rituximab-p19 AEX peaks 1, 2, and 3, which are enumerated in FIG. 4B.

FIG. 4D is an image of a denaturing SDS PAGE 6% tris-glycine gel comparing rituximab-PEG24-N3 (lane A), crude conjugation reaction mixture (lane B), and isolated rituximab-p19 AEX peaks 1 (lane C), 2 (lane D), and 3 (lane E).

FIG. 5 is a graph showing the efficacy of the murine immunostimulating polynucleotides to induce IL-6 dose-dependently in murine splenocytes. The illustrated data indicate that, for murine immunostimulating polynucleotide sequence of p18, at least 15 phosphorothioates are preferable to achieve immunostimulating activity. In the absence of conjugated targeting moieties, a phosphorothioate backbone is an important feature controlling the efficacy of immunostimulating polynucleotides to induce IL-6.

FIG. 6 is a graph showing the efficacy of the immunoconjugates of the invention and CpG 7909 in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases after 5.5 h of treatment. The x-axis provides the concentration (nM) of the conjugate on the log scale.

FIG. 7 is a graph showing the efficacy of the immunoconjugates and CpG 7909 in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases after 24 h of treatment and 2.5 h of QB incubation. The xaxis provides log of the concentration (M) of the conjugates on the linear scale.

FIG. 8 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases after 48 h of treatment and 2.5 h of QB incubation. The xaxis provides log of the concentration (M) of the conjugates on the linear scale.

FIG. 9 is a graph comparing the efficacy of p1 and p6 polynucleotides in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 10 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 11 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 12 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 13 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 14 is a graph showing the efficacy of the immunoconjugates in the activation of NFκB dose-dependently in Ramos Blue cells, as measured by the levels of alkaline phosphatases.

FIG. 15 is a graph showing the efficacy of the immunoconjugates in the dose-dependent induction of IL-6 in DB cells. The y-axis shows the multiplier for the increase of IL6 secretion normalized to PPIB levels.

FIG. 16 is a graph showing the efficacy of the immunoconjugates in the dose-dependent induction of NFκB in Ramos Blue cells. This figure compares the conjugates having one polynucleotide (Dari) or two polynucleotides (Dar2) to activate NFκB.

FIG. 17 is a graph showing the efficacy of the immunoconjugates in the dose-dependent induction of IL-6 in DB cells. This figure compares the conjugates having one polynucleotide (Dari) or two polynucleotides (Dar2) to induce IL6. The y-axis shows the multiplier for the increase of IL6 secretion normalized to PPIB levels.

FIG. 18 is a graph showing the efficacy of the immunoconjugates containing immunostimulating polynucleotides of varying length in activating NFκB in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 19 is a graph showing the efficacy of the immunoconjugates containing immunostimulating polynucleotides of varying length in activating NFκB in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 20 is a graph showing the comparison of the immunostimulating activity of conjugates containing polynucleotides with 5′-terminal 5-iodo-2-deoxyuridine that is bonded to an internucleoside phosphodiester phosphate to the immunostimulating activity of conjugates containing polynucleotides with 5′-terminal 5-iodo-2-deoxyuridine that is bonded to an internucleoside phosphodiester phosphorothioate. The immunostimulating activities were assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 21 is a graph showing the comparison of the immunostimulating activity of conjugates containing polynucleotides with 5′-terminal 5-iodo-2-deoxyuridine that is bonded to an internucleoside phosphodiester phosphate to the immunostimulating activity of conjugates containing polynucleotides with 5′-terminal 5-iodo-2-deoxyuridine that is bonded to an internucleoside phosphodiester phosphorothioate. The immunostimulating activities were assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 22 is a graph showing the comparison of the immunostimulating activities of conjugates containing one or more 5-iodo-2-deoxyuridines. The immunostimulating activities were assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 23 is a graph showing the comparison of the immunostimulating activities of conjugates containing or lacking 5-iodo-2-deoxyuridine. The immunostimulating activities were assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 24 is a graph showing the comparison of immunostimulating activities of conjugates containing internucleoside phosphotriesters that are phosphate-based or phosphorothioate-based. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 25 is a graph showing the comparison of immunostimulating activities of conjugates containing internucleoside phosphotriesters that are phosphate-based or phosphorothioate-based. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 26A is a graph showing the comparison of immunostimulating activities of conjugates containing one or more phosphorothioate-based internucleoside phosphotriesters. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 26B is a graph showing the comparison of immunostimulating activities of conjugates containing one or more phosphorothioate-based internucleoside phosphotriesters. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 27 is a graph showing the comparison of immunostimulating activities of conjugates containing an antibody and one or more immunostimulating polynucleotides. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout.

FIG. 28 is a graph showing the comparison of cellular dependent cytotoxicity (CDC) of immunostimulating polynucleotides conjugated through a heavy chain Q-tag or a light chain Q-tag in an antibody. The CDC assay was performed in Daudi cells incubated with the conjugates in human sera, and the cytotoxicity was measured by fluorescence.

FIG. 29 is a graph showing the comparison of immunostimulating activities of conjugates having auxiliary moieties. The immunostimulating activity was assessed through the measurement of the NFκB activation in Ramos-Blue cells, as measured by alkaline phosphatase readout. The designator in parenthesis indicates the linker/auxiliary moiety structure used in the conjugate, no AM indicates that conjugate SB-189 does not contain an auxiliary moiety.

FIG. 30 is a graph showing the comparison of CDC activities of conjugates having auxiliary moieties. The CDC assay was performed in Daudi cells incubated with the conjugates in human sera, and the cytotoxicity was measured by fluorescence.

FIG. 31 is a graph showing the induction of IL6 in A20 mouse B-cell lymphoma cells using conjugates containing a truncated murine cross-reactive human immunostimulating polynucleotide (p275) linked through a Q-tag to a murine anti-CD22 antibody.

FIG. 32 is a graph showing the induction of IL6 in A20 mouse B-cell lymphoma cells using conjugates containing a truncated murine cross-reactive human immunostimulating polynucleotide (p275) linked through a Q-tag to a murine anti-CD22 antibody.

FIG. 33A is a graph showing the induction of IL6 in A20 mouse B-cell lymphoma cells using conjugates containing immunostimulating polynucleotides or an unconjugated immunostimulating polynucleotide.

FIG. 33B is a graph showing the induction of IL6 in A20 mouse B-cell lymphoma cells by conjugates containing an anti-mouse CD22 antibody and an immunostimulating polynucleotide in the presence of varying concentration of the free anti-mouse CD22 antibody.

FIG. 34A is a graph showing the induction of interferon-α in human PBMC by CpG-2336, a class A CpG ODN.

FIG. 34B is a graph showing the induction of interferon-α in human PBMC using conjugate SB-340. Anti-BDCA2 antibody, SB-341, and p246 were used as controls in this experiment. The Y-axis provides optical density in arbitrary units at the wavelength of 450 nm.

FIG. 34C is a graph showing the induction of interferon-α in purified plasmacytoid cells using conjugate SB-342. Anti-BDCA2 antibody, anti-BDCA4 antibody, and SB-343 were used as controls in this experiment.

FIG. 35 is a graph showing the comparison of immunostimulatory activity of the polynucleotides with various 5′-terminal modifications and internucleoside triesters.

FIG. 36 is a graph showing the comparison of immunostimulatory activity of the polynucleotides with various 5′-terminal modifications and internucleoside triesters.

FIG. 37A is a graph showing tumor volume growth progression following inoculation of a mouse with A20 mouse B-cell lymphoma cells and the subsequent, triple, intratumoral administration of a vehicle (saline) or an immunostimulating polynucleotide of the invention (p326) and a control (p18). The administration times are indicated with the arrows on the X-axis.

FIG. 37B is a graph showing tumor volume growth progression following inoculation of a mouse with A20 mouse B-cell lymphoma cells and the subsequent, triple, intravenous administration of a vehicle (saline), an immunostimulating polynucleotide (p3), an anti-CD22 antibody (CD22), or conjugates SB-338, SB-339, or SB-344. The administration times are indicated with the arrows on the X-axis.

FIG. 38A is a graph showing tumor volume growth progression following inoculation of a mouse with A20 mouse B-cell lymphoma cells and the subsequent, triple, intratumoral administration of a vehicle (saline) or an immunostimulating polynucleotide.

FIG. 38B is a graph showing tumor volume values on day 20 after the inoculation of a mouse with A20 mouse B-cell lymphoma cells and the subsequent, triple, intratumoral administration of a vehicle (saline) or an immunostimulating polynucleotide.

FIG. 39A is a graph showing tumor volume growth progression following the inoculation of a mouse with A20 mouse B-cell lymphoma cells and (i) the subsequent, single, intravenous administration of a conjugate of the invention (SB-337), or (ii) the subsequent, triple, intratumoral administration of a vehicle (saline) or an immunostimulating polynucleotide.

FIG. 39B is a graph showing tumor volume values on day 20 after the inoculation of a mouse with A20 mouse B-cell lymphoma cells and (i) the subsequent, single, intravenous administration of a conjugate of the invention (SB-337), or (ii) the subsequent, triple, intratumoral administration of a vehicle (saline) or an immunostimulating polynucleotide.

FIG. 40 is a graph showing the survival rates (%) for Balb/c mice inoculated with A20 mouse lymphoma cells and subsequently treated with saline, free antibodies, antibody-immunostimulating polynucleotide conjugates, or free immunostimulating polynucleotides. The control group are non-inoculated, untreated Balb/c mice. The lines identified as CD22-10 and CD22-3 provide mouse survival rates (%) for the treatment regimens: 10 mg/kg of the free anti-mouse CD22 antibody and 3 mg/kg of the free anti-mouse CD22 antibody, respectively. The lines identified as SB-337-10 and SB-337-3 provide mouse survival rates (%) for the treatment regimens: 10 mg/kg of SB-337 and 3 mg/kg of SB-337, respectively.

FIG. 41A is an image of a denaturing gel of samples of polynucleotides incubated in mouse serum at 37° C. for up to 24 hours.

FIG. 41B is an image of a denaturing gel of samples of polynucleotides incubated in mouse serum at 37° C. for up to 24 hours.

FIG. 41C is an image of a denaturing gel of samples of polynucleotides incubated in rat serum at 37° C. for up to 24 hours.

FIG. 41D is an image of a denaturing gel of samples of polynucleotides incubated in monkey serum at 37° C. for up to 24 hours.

FIG. 41E is an image of a denaturing gel of samples of polynucleotides incubated in human serum at 37° C. for up to 24 hours.

FIG. 42 is a graph showing the effect of phosphate-based and phosphorothioate-based internucleoside phosphodiesters at the 5′-terminus of an immunostimulating polynucleotide on the polynucleotide stability in 80% mouse serum.

FIG. 43 is a graph showing the proportions of degraded p246 and intact p246 in an aging experiment in 80% mouse serum.

FIG. 44 is a graph showing the effect of 5′-terminal nucleotide structures on the stability of the polynucleotides in 80% mouse serum.

FIG. 45 is a graph showing the effect of 5′-terminal nucleotide structures on the stability of the polynucleotides in 80% mouse serum, 80% non-human primate (NHP) serum, and 80% human serum. The mouse serum data are marked with an asterisk, as these data were obtained in a separate study.

FIG. 46A illustrates the experimental scheme as described in Example 6, where mice having disseminated B-cell lymphoma were given intravenous doses of CpG-Ab (CpG ODN conjugated to a mouse anti-CD22 mAb).

FIG. 46B shows the survival rate of mice having disseminated B-cell lymphoma that were treated on Days 1, 3 and 5 with (i) 3 mg/kg CpG (p313)-mAb (CD22) conjugate (closed diamond); (ii) 10 mg/kg CpG-mAb (CD22) (closed triangle); (iii) naked CpG ODN (open triangle); (iv) 10 mg/kg CD22 mAb (closed square); (v) 10 mg/kg GpC-mAb control conjugate (open square); or (vi) saline solution (closed circle).

FIG. 46C shows the survival rates of mice which survived from the first tumor challenge and subsequently subjected to a second tumor challenge on Day 47. No treatment was given to the survivor after the second tumor challenge. Survivors treated with 10 mg/kg CpG-mAb (CD22) on Days 1, 3, and 5 (down triangle); survivors treated with 3 mg/kg CpG-mAb (CD22) on Days 1, 3, and 5 (diamond); second control group challenged with tumor cells on Day 47 and treated with saline solution (up triangle).

FIG. 46D shows the experiment where mice survived from the first and second tumor challenges were subsequently subjected to a third tumor challenge on Day 90. No treatment was given to the survivors after the second or third tumor challenge. A third control group was challenged with tumor cells on Day 90 and treated with saline solution. The tumor volumes of survivors (square) and the control group (circle) were monitored between Day 90 and Day 120.

FIG. 47A illustrates the experimental scheme as described in Example 7, where mice having solid B-cell lymphoma were given intravenous doses of CpG-Ab (CpG ODN conjugated to a mouse anti-CD22 mAb).

FIG. 47B shows the tumor volume of mice having solid B-cell lymphoma that were treated on Day 9, 12 and 14 with (i) 3 mg/kg CpG-mAb (CD22) (open diamond); (ii) 10 mg/kg CpG-mAb (CD22) (large closed triangle); (iii) naked CpG ODN (open triangle); (iv) 10 mg/kg CD22 mAb (closed square); (v) 10 mg/kg GpC-mAb control conjugate (small closed square), or (vi) saline solution (closed circle).

FIG. 47C shows the tumor volume of mice having solid B-cell lymphoma that were treated with SB-337 DAR1 at 10 mg/kg or SB-337 DAR2 at 10 mg/kg in comparison with controls (saline and SB-339).

FIG. 47D shows the tumor volume of mice having solid B-cell lymphoma that were treated with SB-337 PEG24Bis DAR1 at 10 mg/kg or SB-337 PEG24Bis DAR2 at 10 mg/kg in comparison with controls (saline and SB-339).

FIG. 47E shows the tumor volume of mice having solid B-cell lymphoma that were treated with PD-1 at 10 mg/kg, PD-1 at 10 mg/kg plus SB-337 DAR1 at 3 mg/kg; or PD-1 at 10 mg/kg plus SB-337 DAR2 at 3 mg/kg in comparison with a saline control.

FIG. 47F shows the effect of p347, SB-337 DAR1, and SB-337 DAR2 on the weights of mice in comparison with controls (saline and mCD22).

FIG. 48A illustrates the experimental scheme as described in Example 8, where mice having solid colon carcinoma were given intravenous doses of B-cell targeting CpG-Ab (CpG ODN conjugated to a mouse anti-CD22 mAb) alone or in combination with anti-PD-1 antibody.

FIG. 48B shows the tumor volume of mice having solid B-cell lymphoma model after receiving (i) 3 mg/kg CpG-mAb (CD22) (up triangle); (ii) anti-PD-1 antibody (closed square); (iii) 3 mg/kg CpG-mAb (CD22) in combination with anti-PD-1 antibody (down triangle); and (iv) saline solution (closed circle).

FIG. 49A shows the tumor volume in immune-competent Balb/C mice having solid B-cell lymphoma after receiving (i) 10 mg/kg CpG-mAb (CD22) (triangle) or saline solution (circle).

FIG. 49B shows the tumor volume in immune-compromised Nu/Nu mice having solid B-cell lymphoma after receiving (i) 10 mg/kg CpG-mAb (CD22) (square), (ii) naked CpG ODN (triangle) or (iii) saline solution (circle).

FIG. 49C shows the tumor volume in immune-compromised SCID mice having solid B-cell lymphoma after receiving (i) 10 mg/kg CpG-mAb (CD22) (square), (ii) naked CpG ODN (triangle) or (iii) saline solution (circle).

FIG. 50A shows the survival rate of mice having soluble B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) CpG-mAb (CD22) and CD4+ T cell depletion treatment (open square); (iii) CD4+ T cell depletion treatment (closed square); or (iv) saline solution (closed circle).

FIG. 50B shows the survival rate of mice having soluble B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) CpG-mAb (CD22) and nature killer (NK) cell depletion treatment (open square); (iii) NK cell depletion treatment (closed square); or (iv) saline solution (closed circle).

FIG. 50C shows the survival rate of mice having soluble B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) CpG-mAb (CD22) and CD8+ T cell depletion treatment (open square); (iii) CD8+ T cell depletion treatment (closed square); or (iv) saline solution (closed circle).

FIG. 51A shows the tumor volume in mice having solid B-cell lymphoma after receiving CpG-mAb (CD22) (square) or saline solution (circle). Mice were sacrificed and tumor were harvested on Day 17 for digestion.

FIG. 51B shows the percentage of CD4+ or CD8+ live gate cells in tumors harvested from mice having solid B-cell lymphoma treated with (i) CpG-Ab (square) or (ii) saline solution (circle).

FIG. 51C shows the correlation between the percentage of CD8+ tumor cells and the tumor volume in mice treated with (i) CpG-Ab (square) or (ii) saline solution (circle).

FIG. 52A shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) anti-PD-1 antibody alone (closed square); (iii) CpG-mAb (CD22) in combination with anti-PD-1 antibody (open square); or (iv) saline solution (closed circle).

FIG. 52B shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) anti-PD-L1 antibody alone (closed triangle); (iii) CpG-mAb (CD22) in combination with anti-PD-L1 antibody (open triangle); or (iv) saline solution (closed circle).

FIG. 52C shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) CpG-mAb (CD22) alone (open circle); (ii) anti-PD-1 antibody alone (closed square); (iii) CpG-mAb (CD22) in combination with anti-PD-1 antibody (open square); (iv) CpG-mAb (CD22) in combination with anti-PD-1 antibody and CD8+ T cell depletion treatment; or (v) saline solution (closed circle).

FIG. 53A shows the average tumor volume in mice having solid B-cell lymphoma after receiving (i) anti-PD-1 antibody alone (square); (ii) CpG-mAb (CD22) in combination with anti-PD-1 antibody (diamond); or (iii) saline solution (circle).

FIG. 53B shows the tumor volumes in individual mice having solid B-cell lymphoma after receiving anti-PD-1 antibody alone.

FIG. 53C shows the tumor volumes in individual mice having solid B-cell lymphoma after receiving the CpG-mAb (CD22)/anti-PD-1 antibody combination treatment.

FIG. 53D shows the tumor volume of survivors from the first tumor challenge (up triangle) and a naive control group (down triangle) after the second tumor challenge.

FIG. 54A shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) (i) anti-OX40 antibody alone (triangle); (ii) CpG-mAb (CD22) in combination with anti-OX40 antibody (diamond); or (iii) saline solution (circle).

FIG. 54B shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) (i) anti-ICOS antibody alone (square); (ii) CpG-mAb (CD22) in combination with anti-ICOS antibody (triangle); or (iii) saline solution (circle).

FIG. 54C shows the tumor volume in mice having solid B-cell lymphoma after receiving (i) anti-4-1 BB antibody alone (diamond); (ii) CpG-mAb (CD22) in combination with anti-4-1 BB antibody (triangle); or (iii) saline solution (circle).

FIG. 55A shows the tumor volume in mice having colon carcinoma after receiving (i) 10 mg/kg CpG-mAb (CD22) or (i) saline solution on each of Days 10, 13 and 16.

FIG. 55B shows the number of IFN-gamma secreting cells in 10⁶ splenocytes isolated from mice treated with (i) CpG-mAb (CD22) or (i) saline solution, before or after stimulating the cells with the AH1 antigen.

FIG. 56A shows the average tumor volume in mice having solid B-cell lymphoma after receiving intravenous doses of (i) 10 mg/kg CpG-Ab (PD-L1) (diamond); (i) 10 mg/kg CpG-Ab (CD205) (triangle); or (iii) saline solution on each of Days 10, 12 and 14.

FIG. 56B shows the tumor volumes in individual mice having B-cell lymphoma after receiving intravenous doses of 10 mg/kg CpG-Ab (CD205) on Days 10, 12, and 14.

FIG. 56C shows the tumor volumes in individual mice having B-cell lymphoma after receiving intravenous doses of 10 mg/kg CpG-Ab (PD-L1) on Days 10, 12, and 14.

FIG. 56D shows the tumor volume of survivors from the first tumor challenge which were treated with CpG-Ab (CD205) (square) or treated with CpG-Ab (PD-L1) (triangle) and a naïve control group (circle) after the second tumor challenge given at Day 38.

FIG. 57A shows the average tumor volume in mice having solid B-cell lymphoma after receiving intravenous doses of (i) 10 mg/kg CpG-Ab (CD205) (triangle); (ii) 10 mg/kg anti-CD205 antibody (square); (iii) 10 mg/kg mouse IgG (open circle); or (iv) saline solution (closed circle), on each of Days 10, 12 and 14.

FIG. 57B shows the tumor volumes in individual mice having solid B-cell lymphoma after receiving intravenous doses of 10 mg/kg anti-CD205 antibody on each of Days 10, 12 and 14.

FIG. 57C shows the tumor volumes in individual mice having solid B-cell lymphoma after receiving intravenous doses of 10 mg/kg CpG-Ab (CD205) on each of Days 10, 12 and 14.

FIG. 57D shows the tumor volumes in individual mice having solid B-cell lymphoma after receiving intravenous doses of 10 mg/kg rat IgG2a antibody on each of Days 10, 12 and 14.

FIG. 58 shows NFκB activation in human Ramos cells after treated with anti-CD38 antibody conjugated to p246 (closed squares), with anti-CD38 antibody conjugated to p4 (closed circles), with unconjugated p246 (open squares) or with unconjugated p4 (open circles).

FIG. 59 shows complement activation (as measured by C3 release) after incubating monkey serum with Zymosan (inverted triangle; positive control), p1 (closed circles), or two CpG-containing immunostimulating polynucleotides as provided herein (closed squares and closed triangles).

FIG. 60A shows the average tumor volume growth progression of mice with A20 mouse B-cell lymphoma cell xenografts following intravenous doses of (i) saline solution (closed circle); (ii) 3 mg/kg CpG-Ab (4523-CD22; SB-337) (square); (Hi) 3 mg/kg CD19-mAb (down closed triangle); (iv) 3 mg/kg CpG-Ab (4523-CD19; SB-388) (closed diamond); (v) 1.9 μg/mouse naked CpG (P347) (up triangle); (vi) 19 μg/mouse naked CpG (p347) (down open triangle); (vii) 190 μg/mouse naked CpG (P347) (open diamond); on each of Days 10, 12 and 14.

FIG. 60B shows the average tumor volume at Day 20 of mice with A20 mouse B-cell lymphoma cell xenografts following intravenous doses of (i) saline solution (solid); (ii) 3 mg/kg CpG-Ab (SB-337) (checkered); (iii) 3 mg/kg CD19-mAb (horizontal); (iv) 3 mg/kg CpG-Ab (SB-388) (vertical); (v) 1.9 μg/mouse naked CpG (P347) (downward diagonal); on each of Days 10, 12 and 14.

FIG. 60C shows the average body weight change with the tumor weight change removed at Day 20 of mice with A20 mouse B-cell lymphoma cell xenografts following intravenous doses of (i) saline solution (filled); (ii) 3 mg/kg CpG-Ab (SB-337) (checkered); (iii) 3 mg/kg CD19-mAb (horizontal); (iv) 3 mg/kg CpG-Ab (SB-388) (vertical); (v) 1.9 μg/mouse naked CpG (P347) (downward diagonal); (vi) 19 μg/mouse naked CpG (P347) (grid); (vii) 190 μg/mouse naked CpG (P347) (upward diagonal); on each of Days 10, 12 and 14.

FIG. 61A shows the average tumor volume growth progression of mice after B16F10 melanoma re-challenge following intratumoral dosing of (i) saline solution (closed circle); or (ii) p347 (closed square); on each of Days 7, 9, 11, and 13, and re-challenge on day 14.

FIG. 61B shows the lung metastases from mice after B16F10 melanoma re-challenge following intratumoral dosing of saline solution (top panel), or p347 (bottom panel); on each of Days 7, 9, 11, and 13, and re-challenge on day 14.

FIG. 61C shows the average tumor volume growth progression of mice inoculated with CT26 colorectal xenografts following intratumoral dosing of (i) saline solution (upward triangle); or (ii) p347 (downward triangle); on each of Days 7, 10, 12, and 14.

FIG. 62A shows the average tumor volume growth progression of genetic B-cell deficient mice using CT26 colorectal model following intravenous dosing of (i) saline solution (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square); on each of Days 10, 12, and 14.

FIG. 62B shows the average tumor volume growth progression of anti-CD20 mAb B-cell depleted mice using CT26 colorectal model following intravenous dosing of (i) saline solution (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square); on each of Days 10, 12, and 14.

FIG. 63A shows the average tumor volume growth progression of mice using a MC38 colorectal syngeneic model following dosing of (i) saline solution (circle); (ii) 10 mg/kg anti-CD22 (upward triangle); (iii) 10 mg/kg anti-PD-L1 (downward triangle); (iv) 10 mg/kg CD22-CpG (SB-337) (square); or (v) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD-L1 (diamond). Anti-CD22 and CD22-CpG were dosed intravenously on Days 10, 12, and 14; anti-PD-L1 was dosed intraperitoneally on Days 10, 13, and 17. * p=0.01;**p=0.001.

FIG. 63B shows the tumor volume growth progression of each mouse using a MC38 colorectal syngeneic model following intravenous dosing saline on Days 10, 12, and 14

FIG. 63C shows the tumor volume growth progression of each mouse using a MC38 colorectal syngeneic model following intravenous dosing of 10 mg/kg of anti-CD22 mAb on Days 10, 12, and 14.

FIG. 63D shows the tumor volume growth progression of each mouse using a MC38 colorectal syngeneic model following intraperitoneal dosing of 10 mg/kg of anti-PD-L1 on Days 10, 13, and 17.

FIG. 63E shows the tumor volume growth progression of each mouse using a MC38 colorectal syngeneic model following intravenous dosing of 10 mg/kg of CD22-CpG (SB-337) on Days 10, 12, and 14.

FIG. 63F shows the tumor volume growth progression of each mouse using a MC38 colorectal syngeneic model following intravenous dosing of 10 mg/kg of CD22-CpG (SB-337) on Days 10, 12, and 14, plus intraperitoneal dosing of 10 mg/kg of anti-PD-L1 on Days 10, 13, and 17.

FIG. 64A shows the average tumor volume growth progression of mice using a B16F10 melanoma model following dosing of (i) saline solution (circle); (ii) 10 mg/kg anti-CD22 (square); (iii) 10 mg/kg CD22-CpG (SB-337) (triangle); or (iv) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD-L1 (diamond) on Days 10, 12, and 14. Anti-CD22 and CD22-CpG were dosed intravenously; anti-PD-L1 was dosed intraperitoneally. ** p=0.08; *** p=0.03.

FIG. 64B shows the average tumor volume growth progression of mice using a LLC1 Lewis lung carcinoma model following dosing of (i) saline solution (circle); (ii) 10 mg/kg CD22-CpG (SB-337) (circle); (iii) 10 mg/kg anti-PD1 (square); (iv) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD1 (upward triangle) (v) 10 mg/kg anti-PD-L1 (downward triangle); (vi) 10 mg/kg CD22-CpG+10 mg/kg anti-PD-L1 (diamond). Anti-CD22 and CD22-CpG were dosed intravenously on Days 7, 10, and 13; anti-PD-L1 and anti-PD1 were dosed intraperitoneally on Days 7, 10, and 14. ** p=0.023.

FIG. 65A shows the average tumor volume growth progression of mice using the CT26 colorectal model following intravenous dosing of (i) saline solution (circle); (ii) 10 mg/kg CD22-CpG (SB-337) (triangle); or (iii) 10 mg/kg DEC205-CpG (SB-3096) on each of Days 12, 17, 20, and 24.

FIG. 65B shows the tumor volume growth progression of each mouse using the CT26 colorectal model following intravenous dosing of saline on each of Days 12, 17, 20, and 24.

FIG. 65C shows the tumor volume growth progression of each mouse using the CT26 colorectal model following intravenous dosing of 10 mg/kg CD22-CpG (SB-337) on each of Days 12, 17, 20, and 24.

FIG. 65D shows the tumor volume growth progression of each mouse using the CT26 colorectal model following intravenous dosing of 10 mg/kg DEC205-CpG (SB-3096) on each of Days 12, 17, 20, and 24.

FIG. 66A shows the average tumor volume growth progression of mice using a CT26 colorectal model following dosing of (i) saline solution (small circle); (ii) CD4 depletion (big circle); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) CD4 depletion+3 mg/kg CD22-CpG (SB-337) (diamond). CD22-CpG was dosed intravenously on Days 10, 13; and 15. CD4 depletion was performed using anti-CD4.

FIG. 66B shows the average tumor volume growth progression of mice using an A20 lymphoma model following dosing of (i) saline solution (circle); (ii) CD4 depletion (upward triangle); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) CD4 depletion+3 mg/kg CD22-CpG (SB-337) (downward triangle). CD22-CpG was dosed intravenously on Days 10, 12; and 14. CD4 depletion was performed using anti-CD4

FIG. 67A shows the mean fluorescence intensity (MFI) of CD40, CD70, CD80, CD86, MHC-I, MHC II, and 4-1 BBL surface expression on CD19+/B220+ B-cells after in vitro incubation with 1 nM CD22 Ab (checkered); 1 nM CpG (SB-4715) (horizontal line); or 1 nM CpG-Ab (SB-337) (vertical line).

FIG. 67B shows the mean fluorescence intensity (MFI) of CD40, CD80, CD86, and MHC II surface expression on CD19+/B220+ B-cells after in vivo dosing with saline (solid); 10 mg/kg CD22 Ab (checkered); 10 mg/kg CpG (SB-4715) (horizontal line); or 10 mg/kg CpG-Ab (SB-337) (vertical line).

FIG. 68A shows the percent of activated T-cells (CD71+, CD3+) relative to total T-cell (CD3+) population in mice treated with (i) saline (solid); (ii) Ab (anti-CD22) (checkered); (iii) CpG-Ab (SB-337) (horizontal); or (iv) CpG (SB-4715) (vertical).

FIG. 68B shows the percent of activated T-cells (Ki67+, CD3+) relative to total T-cell (CD3+) population in mice treated with (i) saline (solid); (ii) Ab (anti-CD22) (checkered); (iii) CpG-Ab (SB-337) (horizontal); or (iv) CpG (SB-4715) (vertical).

FIG. 69A shows the average tumor volume growth progression of mice using the CT26 colorectal model following intravenous dosing of (i) saline solution (circle); (ii) 10 mg/kg CD22-CpG (SB-337) (square); (iii) 10 mg/kg CD22 (upward triangle); or (iv) Free CpG (P347) (downward triangle) on each of Days 10, 12, 14.

FIG. 69B shows the average tumor volume growth progression of mice using the CT26 colorectal model following adoptively transferred draining lymph node cells from mice treated with (i) saline solution (small circle); (ii) 10 mg/kg CD22-CpG (SB-337) (small square); (iii) 10 mg/kg CD22 (small upward triangle); or (iv) Free CpG (P347) (small downward triangle); or non-draining lymph node cells from mice treated with (v) saline solution (diamond); (vi) 10 mg/kg CD22-CpG (SB-337) (large circle); (vii) 10 mg/kg CD22 (large square); or (viii) Free CpG (P347) (large upward triangle).

FIG. 69C shows the average tumor volume on Day 24 for mice using the CT26 colorectal model following adoptively transferred draining lymph node cells from mice treated with (i) saline solution (upward narrow diagonal); (ii) 10 mg/kg CD22-CpG (SB-337) (downward narrow diagonal); (iii) 10 mg/kg CD22 (grid); or (iv) Free CpG (P347) (wide downward diagonal); or non-draining lymph node cells from mice treated with (v) saline solution (solid); (vi) 10 mg/kg CD22-CpG (SB-337) (checkered); (vii) 10 mg/kg CD22 (horizontal); or (viii) Free CpG (P347) (empty).

FIG. 70A shows the plasma concentration of IL-6 in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 70B shows the plasma concentration of IL-1β in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 70C shows the plasma concentration of IL-10 in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 70D shows the plasma concentration of IL-12p70 in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (Sp347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 70E shows the plasma concentration of IFNγ in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 70F shows the plasma concentration of TNFα in naïve mice treated intravenously with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug/dose free CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337) (vertical).

FIG. 71A shows the percentage of B-cells (B220+) relative to total cell in spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square) on each of Days 10, 13, and 17. * p<0.05

FIG. 71B shows the percentage of germinal center (GC) cells (B220⁺, IgD^(lo), Fas⁺) relative to total cell in spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square) on each of Days 10, 13, and 17. * p<0.05

FIG. 71C shows the percentage of T follicular helper (T_(fh)) cells (CD4⁺, CXCR5⁺, PD-1⁺) relative to total cell in spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square) on each of Days 10, 13, and 17. * p<0.05

FIG. 71D shows the relative fold change of IL-21 from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 10 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17. *p<0.05

FIG. 71E shows the relative fold change of Bcl-6 from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 10 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17. *p<0.05

FIG. 71F shows the relative fold change of IRF-4 from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 10 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17. *p<0.05

FIG. 72A shows the relative fold change of IL-6 in the spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 72B shows the relative fold change of IL-10 in the spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 72C shows the relative fold change of IL-1β in the spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 72D shows the relative fold change of TNFα in the spleen from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 73A shows the relative fold change of IL-6 in the draining lymph node from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 73B shows the relative fold change of IL-10 in the draining lymph node from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 73C shows the relative fold change of IL-1β in the draining lymph node from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 73D shows the relative fold change of TNFα in the draining lymph node from mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 17.

FIG. 74A shows the concentration of IgM in mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 16. * p<0.05.

FIG. 74B shows the concentration of IgG2a in mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 16. *p<0.05

FIG. 74C shows the concentration of IgG in mice using the CT26 colorectal model following intravenous dosing of (i) saline; or (ii) 3 mg/kg CpG-mAb (SB-337) on each of Days 10, 13, and 16. * p<0.05

FIG. 75 shows the scheme and quantification of mouse anti-AH1 IgG2a in the serum from mice treated intravenously with saline (circle), or 3 mg/kg of CpG-mAb (SB-337) (square) measured using a commercially available secondary anti-mouse IgG2a-HRP antibodies, 2^(nd) Ab1; or measuring treatment with saline (downward triangle), or 3 mg/kg of CpG-mAb (SB-337) (diamond) using a second commercially available secondary anti-mouse IgG2a-HRP antibodies, 2^(nd) Ab2.

FIG. 76A shows the percentage of regulatory B cells (Bregs; CD19⁺, B220⁺, CD1d^(hi)) relative to total B-cells (B220+) in spleen from mice following weekly intravenous dosing of (i) saline (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square). * p<0.001

FIG. 76B shows the percentage of regulatory B cells (Bregs; CD19⁺, B220⁺, CD1d^(hi)) relative to total cells in spleen from mice following weekly intravenous dosing of (i) saline (circle); or (ii) 10 mg/kg CpG-mAb (SB-337) (square). * p<0.001

FIG. 77A shows the percentage of spleen myeloid dendritic cells (mDC; B220⁻, CD11C⁺; DEC205^(hi)) relative to total cells in spleen lymph nodes from mice using the CT26 colorectal model treated intravenously with (i) saline (circle); (ii) 10 mg/kg CpG-mAb (SB-337) (square); or (iii) 10 mg/kg CpG; (triangle) on each of Days 14, 17, and 30. * p=0.0002, ^(&) p=0.003, ^(#) p=0.002.

FIG. 77B shows the percentage of pooled lymph node (LN) myeloid dendritic cells (mDC; B220⁻, CD11C⁺; CD8⁺) relative to total cells from mice using the CT26 colorectal model treated intravenously with (i) saline (circle); (ii) 10 mg/kg CpG-mAb (SB-337) (square); or (iii) 10 mg/kg CpG (triangle); on each of Days 14, 17, and 30. Sample were taken from drained lymph nodes (dLN) and non-drained lymph nodes (ndLN).

FIG. 78A shows the average tumor volume growth progression of mice using the CT26 colorectal model following treatment with (i) saline solution (circle); (ii) plasmacytoid dendritic cell (pDC) depletion (downward triangle); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) pDC depletion+3 mg/kg CD22-CpG (SB-337) (upward triangle) on each of Days 10, 13, and 15.

FIG. 78B shows the average tumor volume growth progression of mice using the A20 lymphoma model following treatment with (i) saline solution (small circle); (ii) plasmacytoid dendritic cell (pDC) depletion (diamond); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) pDC depletion+3 mg/kg CD22-CpG (SB-337) (large circle) on each of Days 10, 12, and 14.

FIG. 79A shows the relative fold change in gene expression of T-cell genes from mice using the CT26 colorectal model following intravenous dosing of (i) saline (solid); or (ii) 3 mg/kg CpG-mAb (SB-337) (checkered) on each of Days 10, 12, and 14.

FIG. 79B shows the relative fold change in gene expression of macrophage genes from mice using the CT26 colorectal model following intravenous dosing of (i) saline (solid); or (ii) 3 mg/kg CpG-mAb (SB-337) (horizontal) on each of Days 10, 12, and 14.

FIG. 79C shows the relative fold change in gene expression of cytokine genes from mice using the CT26 colorectal model following intravenous dosing of (i) saline (solid); or (ii) 3 mg/kg CpG-mAb (SB-337) (vertical) on each of Days 10, 12, and 14.

FIG. 79D shows the relative fold change in gene expression of apoptotic enzyme genes from mice using the CT26 colorectal model following intravenous dosing of (i) saline (solid); (ii) 3 mg/kg CpG-mAb (SB-337) (upward diagonal); (iii) anti-PD-L1 (downward diagonal); (iv) 3 mg/kg CpG-mAb+anti-PD-L1 (SB-337) (grid) on each of Days 10, 12, and 14.

FIG. 80A shows a dose response curve for the concentration of IL-6 from human primary B-cells in response to in vitro treatment with (i) CpG (p425) (square); (ii) CpG-Ab (SB-430) (triangle); or (iii) Ab (diamond) for 24-72 hours.

FIG. 80B shows a dose response curve for the mean fluorescence intensity (MFI) of MHC II expression on human primary B-cells in response to in vitro treatment with (i) CpG (p425) (triangle); or (ii) CpG-Ab (SB-430) (circle) for 24-72 hours.

FIG. 80C shows a dose response curve for the mean fluorescence intensity (MFI) of CD86 expression on human primary B-cells in response to in vitro treatment with (i) CpG (p425) (triangle); or (ii) CpG-Ab (SB-430) (circle) for 24-72 hours.

FIG. 80D shows a dose response curve for the mean fluorescence intensity (MFI) of CD70 expression on human primary B-cells in response to in vitro treatment with (i) CpG (p425) (triangle); or (ii) CpG-Ab (SB-430) (circle) for 24-72 hours.

FIG. 80E shows a dose response curve for the mean fluorescence intensity (MFI) of CD20 expression on human primary B-cells in response to in vitro treatment with (i) CpG (p425) (triangle); or (ii) CpG-Ab (SB-430) (circle) for 24-72 hours.

FIG. 81 shows a dose response curve for the concentration of IL-6 from primary human splenocytes in response to in vitro treatment with (i) hCD22-hCpG (SB-430) (square); (ii) Free human CpG 7909 (downward triangle); or (iii) Free human CpG Solstice (p425) (upward arrow) for 24 hours

FIG. 82A shows the scheme for the humanized mouse model experiment using intraperitoneally (IP) injected fresh human peripheral blood mononuclear cells (hPBMC) prior to subcutaneous transplantation of Daudi Burkitt lymphoma cells and intravenous (IV) treatment at each of Days 12, 14, and 16.

FIG. 82B shows the average tumor volume growth progression in a humanized mouse model intraperitoneally injected with fresh human peripheral blood mononuclear cells prior to subcutaneous transplantation of Daudi Burkitt lymphoma cells and intravenous (IV) treatment with (i) saline (circle); (ii) 5 mg/kg hCD22 Ab (square); (iii) 5.7 μg/dose CpG (p425) (open triangle); or (iv) 5 mg/kg hCD22-CpG (SB-430) (closed triangle), at each of Days 12, 14, and 16.

FIG. 83 shows pharmacokinetic profiles of CpG-antibody conjugate SB-337 DAR1 in mice administered intravenously or subcutaneously.

FIG. 84 shows pharmacokinetic profiles of CpG-antibody conjugate SB-337 DAR1 in mice administered intravenously.

FIG. 85 shows pharmacokinetic profiles of CpG-antibody conjugate SB-337 DAR1 in mice administered intravenously.

FIG. 86 shows pharmacokinetic profiles of CpG-antibody conjugates SB-337 DAR1 and SB-337 DAR2 in mice administered intravenously.

FIGS. 87A and 87B show pharmacokinetic profiles of CpG-antibody conjugates in mice administered intravenously.

DETAILED DESCRIPTION Definitions

The term “abasic spacer,” as used herein, represents a divalent group of the following structure: R¹-L¹-[-L²-(L¹)_(n1)-]_(n2)-R²,   (I) wherein:

n1 is 0 or 1,

n2 is an integer from 1 to 6,

R¹ is a bond to a nucleoside in the immunomodulating polynucleotide,

R² is a bond to a nucleoside in the immunomodulating polynucleotide or to a capping group,

each L¹ is independently a phosphodiester or a phosphotriester, and

each L² is a sugar analogue,

-   -   provided that,     -   if the abasic spacer is an internucleoside, abasic spacer, each         n1 is 1, and R² is a bond to a nucleoside, and     -   if the abasic spacer is a terminal, abasic spacer, each n1 is         independently 0 or 1, and R² is a bond to a capping group.

The term “about,” as used herein, represents a value that is ±10% of the recited value.

The term “alkane-tetrayl,” as used herein, represents a tetravalent, acyclic, straight or branched chain, saturated hydrocarbon group having from 1 to 16 carbons, unless otherwise specified. Alkane-tetrayl may be optionally substituted as described for alkyl.

The term “alkane-triyl,” as used herein, represents a trivalent, acyclic, straight or branched chain, saturated hydrocarbon group having from 1 to 16 carbons, unless otherwise specified. Alkane-triyl may be optionally substituted as described for alkyl.

The term “alkanoyl,” as used herein, represents hydrogen or an alkyl group that is attached to the parent molecular group through a carbonyl group and is exemplified by formyl (i.e., a carboxyaldehyde group), acetyl, propionyl, butyryl, and iso-butyryl. Unsubstituted alkanoyl groups contain from 1 to 7 carbons. The alkanoyl group may be unsubstituted of substituted (e.g., optionally substituted C₁₋₇ alkanoyl) as described herein for alkyl group. The ending “-oyl” may be added to another group defined herein, e.g., aryl, cycloalkyl, and heterocyclyl, to define “aryloyl,” “cycloalkanoyl,” and “(heterocyclyl)oyl.” These groups represent a carbonyl group attached to aryl, cycloalkyl, or heterocyclyl, respectively. Each of “aryloyl,” “cycloalkanoyl,” and “(heterocyclyl)oyl” may be optionally substituted as defined for “aryl,” “cycloalkyl,” or “heterocyclyl,” respectively.

The term “alkenyl,” as used herein, represents acyclic monovalent straight or branched chain hydrocarbon groups of containing one, two, or three carbon-carbon double bonds. Non-limiting examples of the alkenyl groups include ethenyl, prop-1-enyl, prop-2-enyl, 1-methylethenyl, but-1-enyl, but-2-enyl, but-3-enyl, 1-methylprop-1-enyl, 2-methylprop-1-enyl, and 1-methylprop-2-enyl. Alkenyl groups may be optionally substituted as defined herein for alkyl.

The term “alkenylene,” as used herein, refers to a straight or branched chain alkenyl group with one hydrogen removed, thereby rendering this group divalent. Non-limiting examples of the alkenylene groups include ethen-1,1-diyl; ethen-1,2-diyl; prop-1-en-1,1-diyl, prop-2-en-1,1-diyl; prop-1-en-1,2-diyl, prop-1-en-1,3-diyl; prop-2-en-1,1-diyl; prop-2-en-1,2-diyl; but-1-en-1,1-diyl; but-1-en-1,2-diyl; but-1-en-1,3-diyl; but-1-en-1,4-diyl; but-2-en-1,1-diyl; but-2-en-1,2-diyl; but-2-en-1,3-diyl; but-2-en-1,4-diyl; but-2-en-2,3-diyl; but-3-en-1,1-diyl; but-3-en-1,2-diyl; but-3-en-1,3-diyl; but-3-en-2,3-diyl; buta-1,2-dien-1,1-diyl; buta-1,2-dien-1,3-diyl; buta-1,2-dien-1,4-diyl; buta-1,3-dien-1,1-diyl; buta-1,3-dien-1,2-diyl; buta-1,3-dien-1,3-diyl; buta-1,3-dien-1,4-diyl; buta-1,3-dien-2,3-diyl; buta-2,3-dien-1,1-diyl; and buta-2,3-dien-1,2-diyl. The alkenylene group may be unsubstituted or substituted (e.g., optionally substituted alkenylene) as described for alkyl.

The term “alkoxy,” as used herein, represents a chemical substituent of formula —OR, where R is a C₁₋₆ alkyl group, unless otherwise specified. In some embodiments, the alkyl group can be further substituted as defined herein. The term “alkoxy” can be combined with other terms defined herein, e.g., aryl, cycloalkyl, or heterocyclyl, to define an “aryl alkoxy,” “cycloalkyl alkoxy,” and “(heterocyclyl)alkoxy” groups. These groups represent an alkoxy that is substituted by aryl, cycloalkyl, or heterocyclyl, respectively. Each of “aryl alkoxy,” “cycloalkyl alkoxy,” and “(heterocyclyl)alkoxy” may optionally substituted as defined herein for each individual portion.

The term “alkyl,” as used herein, refers to an acyclic straight or branched chain saturated hydrocarbon group, which, when unsubstituted, has from 1 to 12 carbons, unless otherwise specified. In certain preferred embodiments, unsubstituted alkyl has from 1 to 6 carbons. Alkyl groups are exemplified by methyl; ethyl; n- and iso-propyl; n-, sec-, iso- and tert-butyl; neopentyl, and the like, and may be optionally substituted, valency permitting, with one, two, three, or, in the case of alkyl groups of two carbons or more, four or more substituents independently selected from the group consisting of: amino; aryl; aryloxy; azido; cycloalkyl; cycloalkoxy; cycloalkenyl; cycloalkynyl; halo; heterocyclyl; (heterocyclyl)oxy; hydroxy; nitro; thiol; silyl; cyano; ═O; ═S; ═NR′, where R′ is H, alkyl, aryl, or heterocyclyl. Each of the substituents may itself be unsubstituted or, valency permitting, substituted with unsubstituted substituent(s) defined herein for each respective group.

The term “alkylamino,” as used herein, refers to a group having the formula —N(R^(N1))₂ or —NHR^(N1), in which R^(N1) is alkyl, as defined herein. The alkyl portion of alkylamino can be optionally substituted as defined for alkyl. Each optional substituent on the substituted alkylamino may itself be unsubstituted or, valency permitting, substituted with unsubstituted substituent(s) defined herein for each respective group.

The term “alkyl cycloalkylene,” as used herein, refers to a saturated divalent hydrocarbon group that is an alkyl cycloalkane, in which two valencies replace two hydrogen atoms. Preferably, at least one of the two valencies is present on the cycloalkane portion. The alkane and cycloalkane portions may be optionally substituted as the individual groups as described herein.

The term “alkylene,” as used herein, refers to a saturated divalent hydrocarbon group that is a straight or branched chain saturated hydrocarbon, in which two valencies replace two hydrogen atoms. The valency of alkylene defined herein does not include the optional substituents. Non-limiting examples of the alkylene group include methylene, ethane-1,2-diyl, ethane-1,1-diyl, propane-1,3-diyl, propane-1,2-diyl, propane-1,1-diyl, propane-2,2-diyl, butane-1,4-diyl, butane-1,3-diyl, butane-1,2-diyl, butane-1,1-diyl, and butane-2,2-diyl, butane-2,3-diyl. The term “C_(x-y) alkylene” represents alkylene groups having between x and y carbons. Exemplary values for x are 1, 2, 3, 4, 5, and 6, and exemplary values for y are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. Alkylene can be optionally substituted as described herein for alkyl.

The term “alkylsulfenyl,” as used herein, represents a group of formula —S-(alkyl). Alkylsulfenyl may be optionally substituted as defined for alkyl.

The term “alkylsulfinyl,” as used herein, represents a group of formula —S(O)-(alkyl). Alkylsulfinyl may be optionally substituted as defined for alkyl.

The term “alkylsulfonyl,” as used herein, represents a group of formula —S(O)₂-(alkyl). Alkylsulfonyl may be optionally substituted as defined for alkyl.

The term “alkynyl,” as used herein, represents monovalent straight or branched chain hydrocarbon groups of from two to six carbon atoms containing at least one carbon-carbon triple bond and is exemplified by ethynyl, 1-propynyl, and the like. The alkynyl groups may be unsubstituted or substituted (e.g., optionally substituted alkynyl) as defined for alkyl.

The term “5-alkynyluridine,” as used herein, represents a nucleoside, in which the nucleobase is 5-alkynyluracil of the following structure:

where R is a bond to the anomeric carbon of the pentafuranose of the nucleoside, and X is alkynyl. In some embodiments, X is ethynyl or propynyl (e.g., X is ethynyl).

The term “alkynylene,” as used herein, refers to a straight-chain or branched-chain divalent substituent including one or two carbon-carbon triple bonds and containing only C and H when unsubstituted. Non-limiting examples of the alkynylene groups include ethyn-1,2-diyl; prop-1-yn-1,3-diyl; prop-2-yn-1,1-diyl; but-1-yn-1,3-diyl; but-1-yn-1,4-diyl; but-2-yn-1,1-diyl; but-2-yn-1,4-diyl; but-3-yn-1,1-diyl; but-3-yn-1,2-diyl; but-3-yn-2,2-diyl; and buta-1,3-diyn-1,4-diyl. The alkynylene group may be unsubstituted or substituted (e.g., optionally substituted alkynylene) as described for alkynyl groups.

The term “amino,” as used herein, represents —N(R^(N1))₂, where, if amino is unsubstituted, both R^(N1) are H; or, if amino is substituted, each R^(N1) is independently H, —OH, —NO₂, —N(R^(N2))₂, —SO₂OR^(N2), —SO₂R^(N2), —SOR^(N2), —COOR^(N2), an N-protecting group, alkyl, alkenyl, alkynyl, alkoxy, aryl, arylalkyl, aryloxy, cycloalkyl, cycloalkenyl, heteroalkyl, or heterocyclyl, provided that at least one R^(N1) is not H, and where each R^(N2) is independently H, alkyl, or aryl. Each of the substituents may itself be unsubstituted or substituted with unsubstituted substituent(s) defined herein for each respective group. In some embodiments, amino is unsubstituted amino (i.e., —NH₂) or substituted amino (e.g., —NHR^(N1)), where R^(N1) is independently —OH, —SO₂OR^(N2), —SO₂R^(N2), —SOR^(N2), —COOR^(N2), optionally substituted alkyl, or optionally substituted aryl, and each R^(N2)can be optionally substituted alkyl or optionally substituted aryl. In some embodiments, substituted amino may be alkylamino, in which the alkyl groups are optionally substituted as described herein for alkyl. In certain embodiments, an amino group is —NHR^(N1), in which R^(N1) is optionally substituted alkyl. Non-limiting examples of —NHR^(N1), in which R^(N1) is optionally substituted alkyl, include: optionally substituted alkylamino, a proteinogenic amino acid, a non-proteinogenic amino acid, a C₁₋₆ alkyl ester of a proteinogenic amino acid, and a C₁₋₆ alkyl ester of a non-proteinogenic amino acid.

The term “aminoalkyl,” as used herein, represents an alkyl substituted with one, two, or three amino groups, as defined herein. Aminoalkyl may be further optionally substituted as described for alkyl groups.

The term “arene-tetrayl,” as used herein, represents a tetravalent group that is an aryl group, in which three hydrogen atoms are replaced with valencies. Arene-tetrayl can be optionally substituted as described herein for aryl.

The term “aryl,” as used herein, represents a mono-, bicyclic, or multicyclic carbocyclic ring system having one or two aromatic rings. Aryl group may include from 6 to 10 carbon atoms. All atoms within an unsubstituted carbocyclic aryl group are carbon atoms. Non-limiting examples of carbocyclic aryl groups include phenyl, naphthyl, 1,2-dihydronaphthyl, 1,2,3,4-tetrahydronaphthyl, fluorenyl, indanyl, indenyl, etc. The aryl group may be unsubstituted or substituted with one, two, three, four, or five substituents independently selected from the group consisting of: alkyl; alkenyl; alkynyl; alkoxy; alkylsulfinyl; alkylsulfenyl; alkylsulfonyl; amino; aryl; aryloxy; azido; cycloalkyl; cycloalkoxy; cycloalkenyl; cycloalkynyl; halo; heteroalkyl; heterocyclyl; (heterocyclyl)oxy; hydroxy; nitro; thiol; silyl; and cyano. Each of the substituents may itself be unsubstituted or substituted with unsubstituted substituent(s) defined herein for each respective group.

The term “aryl alkyl,” as used herein, represents an alkyl group substituted with an aryl group. The aryl and alkyl portions may be optionally substituted as the individual groups as described herein.

The term “aryl alkylene,” as used herein, represents an aryl alkyl group, in which one hydrogen atom is replaced with a valency. Aryl alkylene may be optionally substituted as described herein for aryl alkyl.

The term “arylene,” as used herein, represents an aryl group, in which one hydrogen atom is replaced with a valency. Arylene may be optionally substituted as described herein for aryl.

The term “aryloxy,” as used herein, represents a chemical substituent of formula —OR, where R is an aryl group, unless otherwise specified. In optionally substituted aryloxy, the aryl group is optionally substituted as described herein for aryl.

The term “auxiliary moiety,” as used herein, represents a monovalent group containing a hydrophilic polymer, a positively charged polymer, or a sugar alcohol.

The term “optionally substituted N,” as used herein, represents a divalent —N(R^(N1))— group or a trivalent —N═ group. The aza group may be unsubstituted, where R^(N1) is H or absent, or substituted, where R^(N1) is as defined for “amino,” except R^(N1) is not H. Two aza groups may be connected to form “diaza.”

The term “optionally substituted N-protected amino,” as used herein, represents substituted amino, as defined herein, in which at least one substituent is an N-protecting group and the other substituent is H, if N-protected amino is unsubstituted, or a substituent other than H, if N-protected amino is substituted.

The term “azido,” as used herein, represents an —N₃ group.

The term “bulky group,” as used herein, represents any substituent or group of substituents as defined herein, in which the radical bonding to disulfide is a carbon atom that bears one hydrogen atom or fewer if the radical is sp³-hybridized carbon or bears no hydrogen atoms if the radical is sp²-hybridized carbon. The radical is not sp-hybridized carbon. The bulky group bonds to disulfide only through a carbon atom.

The term “5′-5′ cap,” as used herein, represents a group of formula R′-Nuc¹-O-(L^(p))_(n)-, where R′ is phosphate, phosphorothioate, phosphorodithioate, phosphotriester, phosphodiester, hydroxyl, or hydrogen; Nuc¹ is a nucleoside; each L^(P) is independently —P(═X^(E1))(—X^(E2)—R^(E2A))—O—; and n is 1, 2, or 3;

-   -   where each X^(E1) and each X^(E2) is independently O or S, and         each R^(E2A) is independently hydrogen, a bioreversible group, a         non-bioreversible group, an auxiliary moiety, a conjugating         group, a linker bonded to a targeting moiety, or a linker bonded         to a targeting moiety and one or more (e.g., 1 to 6) auxiliary         moieties; and     -   where R′ is bonded to the 3′-carbon of the nucleoside, and —O—         is bonded to the 5′-carbon of the nucleoside.

The term “capping group,” as used herein represents a monovalent or a divalent group situated at the 5′- or 3′-terminus of a polynucleotide. The capping group is a terminal phosphoester; diphosphate; triphosphate; an auxiliary moiety; a bioreversible group; a non-bioreversible group; 5′ cap (e.g., 5′-5′ cap); solid support; a linker bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties; or a group —OR′, where R′ is selected from the group consisting of hydrogen, a bioreversible group, non-bioreversible group, solid support, and O-protecting group. Group —OR′, diphosphate, triphosphate, bioreversible group, non-bioreversible group, solid support, and auxiliaty moiety are examples of monovalent capping groups. A terminal phosphoester is an example of a capping group that can be either monovalent, if the terminal phosphoester does not include a linker to a targeting moiety, or divalent, if the terminal phosphoester includes a linker to a targeting moiety. A linker bonded to a targeting moiety (with our without auxiliary moieties) is an example of a divalent capping group.

The term “carbocyclic,” as used herein, represents an optionally substituted C₃₋₁₆ monocyclic, bicyclic, or tricyclic structure in which the rings, which may be aromatic or non-aromatic, are formed by carbon atoms. Carbocyclic structures include cycloalkyl, cycloalkenyl, cycloalkynyl, and certain aryl groups.

The term “carbonyl,” as used herein, represents a —C(O)— group.

The expression “C_(x-y),” as used herein, indicates that the group, the name of which immediately follows the expression, when unsubstituted, contains a total of from x to y carbon atoms. If the group is a composite group (e.g., aryl alkyl), C_(x-y) indicates that the portion, the name of which immediately follows the expression, when unsubstituted, contains a total of from x to y carbon atoms. For example, (C₆₋₁₀-aryl)-C₁₋₆-alkyl is a group, in which the aryl portion, when unsubstituted, contains a total of from 6 to 10 carbon atoms, and the alkyl portion, when unsubstituted, contains a total of from 1 to 6 carbon atoms.

The term “cyano,” as used herein, represents —CN group.

The term “cycloaddition reaction” as used herein, represents reaction of two components in which a total of [4n+2] π electrons are involved in bond formation when there is either no activation, activation by a chemical catalyst, or activation using thermal energy, and n is 1, 2, or 3. A cycloaddition reaction is also a reaction of two components in which [4n] π electrons are involved, there is photochemical activation, and n is 1, 2, or 3. Desirably, [4n+2] π electrons are involved in bond formation, and n=1. Representative cycloaddition reactions include the reaction of an alkene with a 1,3-diene (Diels-Alder reaction), the reaction of an alkene with an α,β-unsaturated carbonyl (hetero Diels-Alder reaction), and the reaction of an alkyne with an azido compound (e.g., Hüisgen cycloaddition).

The term “cycloalkenyl,” as used herein, refers to a non-aromatic carbocyclic group having at least one double bond in the ring and from three to ten carbons (e.g., a C₃-C₁₀ cycloalkenyl), unless otherwise specified. Non-limiting examples of cycloalkenyl include cycloprop-1-enyl, cycloprop-2-enyl, cyclobut-1-enyl, cyclobut-1-enyl, cyclobut-2-enyl, cyclopent-1-enyl, cyclopent-2-enyl, cyclopent-3-enyl, norbornen-1-yl, norbornen-2-yl, norbornen-5-yl, and norbornen-7-yl. The cycloalkenyl group may be unsubstituted or substituted (e.g., optionally substituted cycloalkenyl) as described for cycloalkyl.

The term “cycloalkenyl alkyl,” as used herein, represents an alkyl group substituted with a cycloalkenyl group, each as defined herein. The cycloalkenyl and alkyl portions may be substituted as the individual groups defined herein.

The term “cycloalkenylene,” as used herein, represents a divalent group that is a cycloalkenyl group, in which one hydrogen atom is replaced with a valency. Cycloalkenylene may be optionally substituted as described herein for cycloalkyl. A non-limiting example of cycloalkenylene is cycloalken-1,3-diyl.

The term “cycloalkoxy,” as used herein, represents a chemical substituent of formula —OR, where R is cycloalkyl group, unless otherwise specified. In some embodiments, the cycloalkyl group can be further substituted as defined herein.

The term “cycloalkyl,” as used herein, refers to a cyclic alkyl group having from three to ten carbons (e.g., a C₃-C₁₀ cycloalkyl), unless otherwise specified. Cycloalkyl groups may be monocyclic or bicyclic. Bicyclic cycloalkyl groups may be of bicyclo[p.q.0]alkyl type, in which each of p and q is, independently, 1, 2, 3, 4, 5, 6, or 7, provided that the sum of p and q is 2, 3, 4, 5, 6, 7, or 8. Alternatively, bicyclic cycloalkyl groups may include bridged cycloalkyl structures, e.g., bicyclo[p.q.r]alkyl, in which r is 1, 2, or 3, each of p and q is, independently, 1, 2, 3, 4, 5, or 6, provided that the sum of p, q, and r is 3, 4, 5, 6, 7, or 8. The cycloalkyl group may be a spirocyclic group, e.g., spiro[p.q]alkyl, in which each of p and q is, independently, 2, 3, 4, 5, 6, or 7, provided that the sum of p and q is 4, 5, 6, 7, 8, or 9. Non-limiting examples of cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, 1-bicyclo[2.2.1,]heptyl, 2-bicyclo[2.2.1,]heptyl, 5-bicyclo[2.2.1,]heptyl, 7-bicyclo[2.2.1,]heptyl, and decalinyl. The cycloalkyl group may be unsubstituted or substituted (e.g., optionally substituted cycloalkyl) with one, two, three, four, or five substituents independently selected from the group consisting of: alkyl; alkenyl; alkynyl; alkoxy; alkylsulfinyl; alkylsulfenyl; alkylsulfonyl; amino; aryl; aryloxy; azido; cycloalkyl; cycloalkoxy; cycloalkenyl; cycloalkynyl; halo; heteroalkyl; heterocyclyl; (heterocyclyl)oxy; hydroxy; nitro; thiol; silyl; cyano; ═O; ═S; ═NR′, where R′ is H, alkyl, aryl, or heterocyclyl. Each of the substituents may itself be unsubstituted or substituted with unsubstituted substituent(s) defined herein for each respective group.

The term “cycloalkyl alkyl,” as used herein, represents an alkyl group substituted with a cycloalkyl group, each as defined herein. The cycloalkyl and alkyl portions may be optionally substituted as the individual groups described herein.

The term “cycloalkylene,” as used herein, represents a divalent group that is a cycloalkyl group, in which one hydrogen atom is replaced with a valency. A non-limiting example of cycloalkylene is cycloalkane-1,3-diyl. Cycloalkylene may be optionally substituted as described herein for cycloalkyl.

The term “cycloalkynyl,” as used herein, refers to a monovalent carbocyclic group having one or two carbon-carbon triple bonds and having from eight to twelve carbons, unless otherwise specified. Cycloalkynyl may include one transannular bond or bridge. Non-limiting examples of cycloalkynyl include cyclooctynyl, cyclononynyl, cyclodecynyl, and cyclodecadiynyl. The cycloalkynyl group may be unsubstituted or substituted (e.g., optionally substituted cycloalkynyl) as defined for cycloalkyl.

The term “dihydropyridazine group,” as used herein represents a divalent group obtainable through cycloaddition between 1,2,4,5-tetrazine group and a strained cycloalkenyl.

The term “halo,” as used herein, represents a halogen selected from bromine, chlorine, iodine, and fluorine.

The term “5-halouridine,” as used herein, represents a nucleoside, in which the nucleobase is 5-halouracil of the following structure:

where R is a bond to the anomeric carbon of the pentafuranose of the nucleoside, and X is fluoro, chloro, bromo, iodo. In some embodiments, X is bromo or iodo.

The term “heteroalkane-tetrayl,” as used herein refers to an alkane-tetrayl group interrupted once by one heteroatom; twice, each time, independently, by one heteroatom; three times, each time, independently, by one heteroatom; or four times, each time, independently, by one heteroatom. Each heteroatom is, independently, O, N, or S. In some embodiments, the heteroatom is O or N. An unsubstituted C_(X-Y) heteroalkane-tetrayl contains from X to Y carbon atoms as well as the heteroatoms as defined herein. The heteroalkane-tetrayl group may be unsubstituted or substituted (e.g., optionally substituted heteroalkane-tetrayl), as described for heteroalkyl.

The term “heteroalkane-triyl,” as used herein refers to an alkane-triyl group interrupted once by one heteroatom; twice, each time, independently, by one heteroatom; three times, each time, independently, by one heteroatom; or four times, each time, independently, by one heteroatom. Each heteroatom is, independently, O, N, or S. In some embodiments, the heteroatom is O or N. An unsubstituted CX Y heteroalkane-triyl contains from X to Y carbon atoms as well as the heteroatoms as defined herein. The heteroalkane-triyl group may be unsubstituted or substituted (e.g., optionally substituted heteroalkane-triyl), as described for heteroalkyl.

The term “heteroalkyl,” as used herein refers to an alkyl, alkenyl, or alkynyl group interrupted once by one or two heteroatoms; twice, each time, independently, by one or two heteroatoms; three times, each time, independently, by one or two heteroatoms; or four times, each time, independently, by one or two heteroatoms. Each heteroatom is, independently, O, N, or S. In some embodiments, the heteroatom is O or N. None of the heteroalkyl groups includes two contiguous oxygen or sulfur atoms. The heteroalkyl group may be unsubstituted or substituted (e.g., optionally substituted heteroalkyl). When heteroalkyl is substituted and the substituent is bonded to the heteroatom, the substituent is selected according to the nature and valency of the heteratom. Thus, the substituent bonded to the heteroatom, valency permitting, is selected from the group consisting of ═O, —N(R^(N2))₂, —SO₂OR^(N3), —SO₂R^(N2), —SOR^(N3), —COOR^(N3), an N-protecting group, alkyl, alkenyl, alkynyl, aryl, cycloalkyl, cycloalkenyl, cycloalkynyl, heterocyclyl, orcyano, where each R^(N2) is independently H, alkyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, or heterocyclyl, and each R^(N3) is independently alkyl, cycloalkyl, cycloalkenyl, cycloalkynyl, aryl, or heterocyclyl. Each of these substituents may itself be unsubstituted or substituted with unsubstituted substituent(s) defined herein for each respective group. When heteroalkyl is substituted and the substituent is bonded to carbon, the substituent is selected from those described for alkyl, provided that the substituent on the carbon atom bonded to the heteroatom is not Cl, Br, or I. It is understood that carbon atoms are found at the termini of a heteroalkyl group.

The term “heteroaryloxy,” as used herein, refers to a structure —OR, in which R is heteroaryl. Heteroaryloxy can be optionally substituted as defined for heterocyclyl.

The term “heterocyclyl,” as used herein, represents a monocyclic, bicyclic, tricyclic, or tetracyclic ring system having fused or bridging 5-, 6-, 7-, or 8-membered rings, unless otherwise specified, containing one, two, three, or four heteroatoms independently selected from the group consisting of nitrogen, oxygen, and sulfur. Heterocyclyl can be aromatic or non-aromatic. Non-aromatic 5-membered heterocyclyl has zero or one double bonds, non-aromatic 6- and 7-membered heterocyclyl groups have zero to two double bonds, and non-aromatic 8-membered heterocyclyl groups have zero to two double bonds and/or zero or one carbon-carbon triple bond. Heterocyclyl groups include from 1 to 16 carbon atoms unless otherwise specified. Certain heterocyclyl groups may include up to 9 carbon atoms. Non-aromatic heterocyclyl groups include pyrrolinyl, pyrrolidinyl, pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, piperidinyl, homopiperidinyl, piperazinyl, pyridazinyl, oxazolidinyl, isoxazolidiniyl, morpholinyl, thiomorpholinyl, thiazolidinyl, isothiazolidinyl, thiazolidinyl, tetrahydrofuranyl, dihydrofuranyl, tetrahydrothienyl, dihydrothienyl, dihydroindolyl, tetrahydroquinolyl, tetrahydroisoquinolyl, pyranyl, dihydropyranyl, dithiazolyl, etc. If the heterocyclic ring system has at least one aromatic resonance structure or at least one aromatic tautomer, such structure is an aromatic heterocyclyl (i.e., heteroaryl). Non-limiting examples of heteroaryl groups include benzimidazolyl, benzofuryl, benzothiazolyl, benzothienyl, benzoxazolyl, furyl, imidazolyl, indolyl, isoindazolyl, isoquinolinyl, isothiazolyl, isothiazolyl, isoxazolyl, oxadiazolyl, oxazolyl, purinyl, pyrrolyl, pyridinyl, pyrazinyl, pyrimidinyl, qunazolinyl, quinolinyl, thiadiazolyl (e.g., 1,3,4-thiadiazole), thiazolyl, thienyl, triazolyl, tetrazolyl, etc. The term “heterocyclyl” also represents a heterocyclic compound having a bridged multicyclic structure in which one or more carbons and/or heteroatoms bridges two non-adjacent members of a monocyclic ring, e.g., quinuclidine, tropanes, or diaza-bicyclo[2.2.2]octane. The term “heterocyclyl” includes bicyclic, tricyclic, and tetracyclic groups in which any of the above heterocyclic rings is fused to one, two, or three carbocyclic rings, e.g., an aryl ring, a cyclohexane ring, a cyclohexene ring, a cyclopentane ring, a cyclopentene ring, or another monocyclic heterocyclic ring. Examples of fused heterocyclyls include 1,2,3,5,8,8a-hexahydroindolizine; 2,3-dihydrobenzofuran; 2,3-dihydroindole; and 2,3-dihydrobenzothiophene. The heterocyclyl group may be unsubstituted or substituted with one, two, three, four or five substituents independently selected from the group consisting of: alkyl; alkenyl; alkynyl; alkoxy; alkylsulfinyl; alkylsulfenyl; alkylsulfonyl; amino; aryl; aryloxy; azido; cycloalkyl; cycloalkoxy; cycloalkenyl; cycloalkynyl; halo; heteroalkyl; heterocyclyl; (heterocyclyl)oxy; hydroxy; nitro; thiol; silyl; cyano; ═O; ═S; ═NR′, where R′ is H, alkyl, aryl, or heterocyclyl. Each of the substituents may itself be unsubstituted or substituted with unsubstituted substituent(s) defined herein for each respective group.

The term “heterocyclyl alkyl,” as used herein, represents an alkyl group substituted with a heterocyclyl group, each as defined herein. The heterocyclyl and alkyl portions may be optionally substituted as the individual groups described herein.

The term “(heterocyclyl)aza,” as used herein, represents a chemical substituent of formula —N(R^(N1))(R^(N2)), where R^(N1) is a heterocyclyl group, and R^(N2) is H, —OH, —NO₂, —N(R^(N2))₂, —SO₂OR^(N2), —SO₂R^(N2), —SOR^(N2), —COOR^(N2), an N-protecting group, alkyl, alkenyl, alkynyl, alkoxy, aryl, arylalkyl, aryloxy, cycloalkyl, cycloalkenyl, heteroalkyl, or heterocyclyl. Preferably, R^(N2) is H.

The term “heterocyclylene,” as used herein, represted a heterocyclyl group, in which one hydrogen atom is replaced with a valency. The heterocyclylene may be optionally substituted in a manner described for heterocyclyl. A non-limiting example of heterocyclylene is heterocycle-1,3-diyl.

The term “(heterocyclyl)oxy,” as used herein, represents a chemical substituent of formula —OR, where R is a heterocyclyl group, unless otherwise specified. (Heterocyclyl)oxy can be optionally substituted in a manner described for heterocyclyl.

The terms “hydroxyl” and “hydroxy,” as used interchangeably herein, represent an —OH group.

The term “immunomodulating polynucleotide” as used herein, represents a polynucleotide construct containing a total of from 6 to 50 contiguous nucleosides covalently bound together by internucleoside bridging groups independently selected from the group consisting of internucleoside phosphoesters and optionally internucleoside abasic spacers. The immunomodulating polynucleotides are capped at 5′- and 3′-termini with 5′- and 3′-capping groups, respectively. The immunomodulating polynucleotides are capable of modulating an innate immune response, as determined by, e.g., a change in the activation of NFκB or a change in the secretion of at least one inflammatory cytokine or at least one type I interferon in an antigen-presenting cell to which an immunomodulating polynucleotide was delivered (e.g., in comparison to another antigen-presenting cell to which an immunomodulating polynucleotide was not delivered). The immunomodulating polynucleotide may contain a conjugating group or, if the immunomodulating polynucleotide is part of a conjugate, a linker bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties (e.g., polyethylene glycols). The conjugating group or the linker may be part of the phosphotriester or the terminal capping group.

The term “immunostimulating polynucleotide” as used herein, represents an immunomodulating polynucleotide capable of activating an innate immune response, as determined by, e.g., an increase in the activation of NFκB or an increase in the secretion of at least one inflammatory cytokine or at least one type I interferon in an antigen-presenting cell to which an immunostimulating polynucleotide was delivered (e.g., in comparison to another antigen-presenting cell to which an immunostimulating polynucleotide was not delivered). In some embodiments, the immunostimulating polynucleotide contains at least one cytidine-p-guanosine (CpG) sequence, in which p is an internucleoside phosphodiester (e.g., phosphate or phosphorothioate) or an internucleoside phosphotriester or phosphothiotriester. As used herein, the CpG-containing immunostimulating polynucleotide can be naturally existing, such as CpG ODNs of bacterial or viral origins, or synthetic. For example, in some embodiments, the CpG sequence in the immunostimulating polynucleotide contains 2′-deoxyribose. In some embodiments, the CpG sequence in the immunostimulating polynucleotide is unmethylated. In some embodiments, the immunostimulating polynucleotide is an oligonucleotide of Formula (A) as provided herein. In some embodiments, the immunostimulating polynucleotide is compound of Formula (B) as provided herein.

The term “immunosuppressive polynucleotide” as used herein, represents an immunomodulating polynucleotide capable of antagonizing an innate immune response, as determined by e.g., a reduction in the activation of NFκB or a reduction in the secretion of at least one inflammatory cytokine or at least one type I interferon in an antigen-presenting cell to which an immunosuppressive polynucleotide was delivered (e.g., in comparison to another antigen-presenting cell to which an immunosuppressive polynucleotide was not delivered).

The term “internucleoside bridging group,” as used herein, represents an internucleoside phosphoester or an internucleoside abasic spacer.

The term “5-modified cytidine,” as used herein represents a nucleoside, in which the nucleobase is of the following structure:

where R is a bond to the anomeric carbon of the pentafuranose of the nucleoside, and X is halogen, alkynyl, alkenyl, alkyl, cycloalkyl, heterocyclyl, or aryl. In some embodiments, 5-modified cytidine is 5-halo cytidine (e.g., 5-iodo cytidine or 5-bromo cytidine). In other embodiments, 5-modified cytidine is 5-alkynyl cytidine.

The term “5-modified uridine,” as used herein represents a nucleoside, in which the nucleobase is of the following structure:

where R is a bond to the anomeric carbon of the pentafuranose of the nucleoside, and X is halogen, alkyl, alkenyl, alkynyl, cycloalkyl, heterocyclyl, or aryl, provided that the 5-modified uridine is not thymidine. In some embodiments, 5-modified uridine is 5-halouridine (e.g., 5-iodouridine or 5-bromouridine). In other embodiments, 5-modified uridine is 5-alkynyl uridine. In some embodiments, 5-modified uridine is a nucleoside containing 2-deoxyribose.

The term “nitro,” as used herein, represents an —NO₂ group.

The term “non-bioreversible,” as used herein, refers to a chemical group that is resistant to degradation under conditions existing inside an endosome. Non-bioreversible groups do not contain thioesters and/or disulfides.

The term “nucleobase,” as used herein, represents a nitrogen-containing heterocyclic ring bound to the V position of the sugar moiety of a nucleotide or nucleoside. Nucleobases can be unmodified or modified. As used herein, “unmodified” or “natural” nucleobases include the purine bases adenine (A) and guanine (G), and the pyrimidine bases thymine (T), cytosine (C) and uracil (U). Modified nucleobases include other synthetic and natural nucleobases such as 5-methylcytosine (5-me-C or m5c), 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thiouracil, 2-thiothymine and 2-thiocytosine, 5-halouracil and cytosine, 5-propynyl uracil and cytosine, 6-azo uracil, cytosine and thymine, 5-uracil (pseudouracil), 4-thiouracil, 8-halo, 8-amino, 8-thiol, 8-thioalkyl, 8-hydroxyl and other 8-substituted adenines and guanines, 5-halo particularly 5-iodo, 5-bromo, 5-trifluoromethyl and other 5-substituted uracils and cytosines, 5-alkynyl (e.g., 5-ethynyl) uracil, 5-acetamido-uracil, 7-methylguanine and 7-methyladenine, 8-azaguanine and 8-azaadenine, 7-deazaguanine and 7-deazaadenine and 3-deazaguanine and 3-deazaadenine. Further nucleobases include those disclosed in U.S. Pat. No. 3,687,808; those disclosed in The Concise Encyclopedia Of Polymer Science And Engineering, pages 858-859, Kroschwitz, J. I., ed. John Wiley & Sons, 1990; those disclosed by Englisch et al., Angewandte Chemie, International Edition, 1991, 30, 613; and those disclosed by Sanghvi, Y. S., Chapter 15, Antisense Research and Applications, pages 289 302, (Crooke et al., ed., CRC Press, 1993). Certain nucleobases are particularly useful for increasing the binding affinity of the hybridized polynucleotides of the invention, including 5-substituted pyrimidines, 6-azapyrimidines and N-2, N-6 and 0-6 substituted purines, including 2-aminopropyladenine, 5-propynyluracil and 5-propynylcytosine. 5-methylcytosine substitutions have been shown to increase nucleic acid duplex stability by 0.6-1.2° C. (Sanghvi et al., eds., Antisense Research and Applications 1993, CRC Press, Boca Raton, pages 276-278). These may be combined, in particular embodiments, with 2′-O-methoxyethyl sugar modifications. United States patents that teach the preparation of certain of these modified nucleobases as well as other modified nucleobases include, but are not limited to, the above noted U.S. Pat. Nos. 3,687,808; 4,845,205; 5,130,302; 5,134,066; 5,175,273; 5,367,066; 5,432,272; 5,457,187; 5,459,255; 5,484,908; 5,502,177; 5,525,711; 5,552,540; 5,587,469; 5,594,121; 5,596,091; 5,614,617; and 5,681,941. For the purposes of this disclosure, “modified nucleobases,” as used herein, further represents nucleobases, natural or non-natural, which include one or more protecting groups as described herein.

The term “nucleoside,” as used herein, represents a pentafuranose-nucleobase combination. The pentafuranose is 2-deoxyribose or a modified version thereof, in which position 2 is substituted with OR, R, halo (e.g., F), SH, SR, NH₂, NHR, NR₂, or CN, where R is an optionally substituted C₁₋₆ alkyl (e.g., C₁₋₆ alkyl or (C₁₋₆ alkoxy)-C₁₋₆-alkyl) or optionally substituted (C₆₋₁₄ aryl)-C₁₋₄-alkyl. In certain embodiments, position 2 is substituted with OR or F, where R is C₁₋₆ alkyl or (C₁₋₆-alkoxy)-C₁₋₆-alkyl. The pentafuranose is bonded to a nucleobase at the anomeric carbon. In some embodiments, the term “nucleoside” refers to a divalent group having the following structure:

in which B¹ is a nucleobase; Y is H, halogen (e.g., F), hydroxyl, optionally substituted C₁₋₆ alkoxy (e.g., methoxy or methoxyethoxy), or a protected hydroxyl group; Y¹ is H or C₁₋₆ alkyl (e.g., methyl); and each of 3′ and 5′ indicate the position of a bond to another group.

The term “nucleotide,” as used herein, refers to a nucleoside that is bonded to a phosphate, phosphorothioate, or phosphorodithioate.

The term “oxo,” as used herein, represents a divalent oxygen atom (e.g., the structure of oxo may be shown as ═O).

The term “patient,” as used herein, represents a human or non-human animal (e.g., a mammal). In some embodiments, the subject may be suffering from a tumor (e.g., a liquid tumor or a solid tumor), as determined by a qualified professional (e.g., a doctor or a nurse practitioner) with or without known in the art laboratory test(s) of sample(s) from the patient.

The term “Ph,” as used herein, represents phenyl.

The term “phosphoester,” as used herein, represents a group containing a phosphate, phosphorothioate, or phosphorodithioate, in which, at least one valency is covalently bonded to a non-hydrogen substituent, provided that at least one non-hydrogen substituent is a group containing at least one nucleoside. A phosphoester, in which one and only one valency is covalently bonded to a group containing a nucleoside, is a terminal phosphoester. A phosphoester, in which two valencies are covalently bonded to nucleoside-containing groups, is an internucleoside phosphoester. A phosphoester may be a group of the following structure:

where

each of X^(E1) and X^(E2) is independently O or S;

each or R^(E1) and R^(E3) is independently hydrogen or a bond to a nucleoside; a sugar analogue of an abasic spacer; a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a linker bonded to a targeting moiety; a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties; or the phosphorus atom in a group of formula —P(═X^(E1))(—X^(E2)—R^(E2A))—O—,

-   -   where R^(E2A) is hydrogen, a bioreversible group, a         non-bioreversible group, an auxiliary moiety, a conjugating         group, a linker bonded to a targeting moiety, or a linker bonded         to a targeting moiety and one or more (e.g., 1 to 6) auxiliary         moieties; and

R^(E2) is hydrogen, a bioreversible group, a non-bioreversible group, an auxiliary moiety, a conjugating group, a linker bonded to a targeting moiety, or a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties;

provided that at least one of R^(E1) and R^(E3) is a bond to a group containing at least one nucleoside. If each of R^(E1) and R^(E3) is independently a bond to a group containing at least one nucleoside, the phosphoester is an internucleoside phosphoester. If one of R^(E1) and R^(E3) is a bond to a group that does not contain a nucleoside, the phosphoester is a terminal phosphoester.

The term “phosphodiester,” as used herein, refers to a phosphoester, in which, two of the three valencies are substituted with non-hydrogen substituents, while the remaining valency is substituted with hydrogen. The phosphodiester consists of phosphate, phosphorothioate, or phosphorodithioate; one or two bonds to nucleoside(s), abasic spacer(s), and/or phosphoryl group(s); and, if the phosphodiester contains only one bond to a nucleoside, an abasic spacer, or a phosphoryl group, one group independently selected from the group consisting of a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a linker bonded to a targeting moiety; and a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties. A terminal phosphodiester includes one bond to a group containing a nucleoside, and one group selected from the group consisting of a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a phosphoryl group; and a linker bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties. An internucleoside phosphodiester includes two bonds to nucleoside-containing groups. A phosphodiester may be a group of the following structure:

where

each of X^(E1) and X^(E2) is independently O or S;

each or R^(E1) and R^(E3) is independently hydrogen or a bond to a nucleoside; a sugar analogue of an abasic spacer; a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a linker bonded to a targeting moiety; a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties; or the phosphorus atom in a group of formula —P(═X^(E1))(—X^(E2)—R^(E2A))—O—,

-   -   where R^(E2A) is hydrogen, a bioreversible group, a         non-bioreversible group, an auxiliary moiety, a conjugating         group, a linker bonded to a targeting moiety, or a linker bonded         to a targeting moiety and one or more (e.g., 1 to 6) auxiliary         moieties; and

R^(E2) is hydrogen, a bioreversible group, a non-bioreversible group, an auxiliary moiety, a conjugating group, a linker bonded to a targeting moiety, or a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties;

provided that one and only one of R^(E1), R^(E2), and R^(E3) is hydrogen; and

provided that at least one of R^(E1) and R^(E3) is a bond to a group containing at least one nucleoside.

If both R^(E1) and R^(E3) are bonds to groups containing at least one nucleoside, the phosphodiester is an internucleoside phosphodiester. If one and only one of R^(E1) and R^(E3) is a bond to a group containing a nucleoside, the phosphodiester is a terminal phosphodiester.

The term “phosphoryl,” as used herein, refers to a substituent of formula —P(═X^(E1))(—X^(E2)—R^(E2A))—O—R^(E3A),

where

each of X^(E1) and X^(E2) is independently O or S;

R^(E2A) is hydrogen, a bioreversible group, a non-bioreversible group, an auxiliary moiety, a conjugating group, a linker bonded to a targeting moiety, or a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties; and

R^(E3A) is hydrogen or an open valency.

When a group is identified as being bonded to a phosphoryl, the group is bonded to the phosphorus atom of the phosphoryl.

The term “phosphotriester,” as used herein, refers to a phosphoester, in which all three valences are substituted with non-hydrogen substituents. The phosphotriester consists of phosphate, phosphorothioate, or phosphorodithioate; one or two bonds to nucleoside(s), or abasic spacer(s), and/or phosphoryl group(s); and one or two groups independently selected from the group consisting of a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; and a linker bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties. A terminal phosphotriester includes one bond to a group containing a nucleoside and two groups independently selected from the group consisting of a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a phosphoryl group; and a linker bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties. In some embodiments, a terminal phosphotriester contains 1 or 0 linkers bonded to a targeting moiety and optionally to one or more (e.g., 1 to 6) auxiliary moieties. An internucleoside phosphotriester includes two bonds to nucleoside-containing groups. A phosphotriester may be a group of the following structure:

where

each of X^(E1) and X^(E2) is independently O or S;

each or R^(E1) and R^(E3) is independently a bond to a nucleoside; a sugar analogue of an abasic spacer; a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a linker bonded to a targeting moiety; a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties; or the phosphorus atom in a group of formula —P(═X^(E1))(—X^(E2)—R^(E2A))—O—

-   -   where R^(E2A) is hydrogen; a bioreversible group; a         non-bioreversible group; an auxiliary moiety; a conjugating         group; a linker bonded to a targeting moiety; or a linker bonded         to a targeting moiety and one or more (e.g., 1 to 6) auxiliary         moieties; and

R^(E2) is a bioreversible group; a non-bioreversible group; an auxiliary moiety; a conjugating group; a linker bonded to a targeting moiety; or a linker bonded to a targeting moiety and one or more (e.g., 1 to 6) auxiliary moieties;

provided that at least one of R^(E1) and R^(E3) is a bond to a group containing at least one nucleoside. If both R^(E1) and R^(E3) are bonds to groups containing at least one nucleoside, the phosphotriester is an internucleoside phosphotriester. If one and only one of R^(E1) and R^(E3) is a bond to a group containing a nucleoside, the phosphotriester is a terminal phosphotriester.

The term “physiological conditions,” as used herein, refer to the conditions that may exist inside a living, mammalian, professional antigen-presenting cell. The physiological conditions include temperatures from about 35° C. to about 42° C. and aqueous pH from about 6 to about 8.

The term “protecting group,” as used herein, represents a group intended to protect a hydroxy, an amino, or a carbonyl from participating in one or more undesirable reactions during chemical synthesis. The term “O-protecting group,” as used herein, represents a group intended to protect a hydroxy or carbonyl group from participating in one or more undesirable reactions during chemical synthesis. The term “N-protecting group,” as used herein, represents a group intended to protect a nitrogen containing (e.g., an amino or hydrazine) group from participating in one or more undesirable reactions during chemical synthesis. Commonly used O- and N-protecting groups are disclosed in Greene, “Protective Groups in Organic Synthesis,” 3^(rd) Edition (John Wiley & Sons, New York, 1999), which is incorporated herein by reference. Exemplary O- and N-protecting groups include alkanoyl, aryloyl, orcarbamyl groups such as formyl, acetyl, propionyl, pivaloyl, t-butylacetyl, 2-chloroacetyl, 2-bromoacetyl, trifluoroacetyl, trichloroacetyl, phthalyl, o-nitrophenoxyacetyl, α-chlorobutyryl, benzoyl, 4-chlorobenzoyl, 4-bromobenzoyl, t-butyldimethylsilyl, tri-iso-propylsilyloxymethyl, 4,4′-dimethoxytrityl, isobutyryl, phenoxyacetyl, 4-isopropylpehenoxyacetyl, dimethylformamidino, and 4-nitrobenzoyl.

Exemplary O-protecting groups for protecting carbonyl containing groups include, but are not limited to: acetals, acylals, 1,3-dithianes, 1,3-dioxanes, 1,3-dioxolanes, and 1,3-dithiolanes.

Other O-protecting groups include, but are not limited to: substituted alkyl, aryl, and aryl-alkyl ethers (e.g., trityl; methylthiomethyl; methoxymethyl; benzyloxymethyl; siloxymethyl; 2,2,2,-trichloroethoxymethyl; tetrahydropyranyl; tetrahydrofuranyl; ethoxyethyl; 1-[2-(trimethylsilyl)ethoxy]ethyl; 2-trimethylsilylethyl; t-butyl ether; p-chlorophenyl, p-methoxyphenyl, p-nitrophenyl, benzyl, p-methoxybenzyl, and nitrobenzyl); silyl ethers (e.g., trimethylsilyl; triethylsilyl; triisopropylsilyl; dimethylisopropylsilyl; t-butyldimethylsilyl; t-butyldiphenylsilyl; tribenzylsilyl; triphenylsilyl; and diphenymethylsilyl); carbonates (e.g., methyl, methoxymethyl, 9-fluorenylmethyl; ethyl; 2,2,2-trichloroethyl; 2-(trimethylsilyl)ethyl; vinyl, allyl, nitrophenyl; benzyl; methoxybenzyl; 3,4-dimethoxybenzyl; and nitrobenzyl).

Other N-protecting groups include, but are not limited to, chiral auxiliaries such as protected or unprotected D, L or D, L-amino acids such as alanine, leucine, phenylalanine, and the like; sulfonyl-containing groups such as benzenesulfonyl, p-toluenesulfonyl, and the like; carbamate forming groups such as benzyloxycarbonyl, p-chlorobenzyloxycarbonyl, p-methoxybenzyloxycarbonyl, p-nitrobenzyloxycarbonyl, 2-nitrobenzyloxycarbonyl, p-bromobenzyloxycarbonyl, 3,4-dimethoxybenzyloxycarbonyl, 3,5-dimethoxybenzyl oxycarbonyl, 2,4-dimethoxybenzyloxycarbonyl, 4-methoxybenzyloxycarbonyl, 2-nitro-4,5-dimethoxybenzyloxycarbonyl, 3,4,5-trimethoxybenzyloxycarbonyl, 1-(p-biphenylyl)-1-methylethoxycarbonyl, α,α-dimethyl-3,5-dimethoxybenzyloxycarbonyl, benzhydryloxy carbonyl, t-butyloxycarbonyl, diisopropylmethoxycarbonyl, isopropyloxycarbonyl, ethoxycarbonyl, methoxycarbonyl, allyloxycarbonyl, 2,2,2,-trichloroethoxycarbonyl, phenoxycarbonyl, 4-nitrophenoxy carbonyl, fluorenyl-9-methoxycarbonyl, cyclopentyloxycarbonyl, adamantyloxycarbonyl, cyclohexyloxycarbonyl, phenylthiocarbonyl, and the like, aryl-alkyl groups such as benzyl, triphenylmethyl, benzyloxymethyl, and the like and silyl groups such as trimethylsilyl, and the like. Useful N-protecting groups are formyl, acetyl, benzoyl, pivaloyl, t-butylacetyl, alanyl, phenylsulfonyl, benzyl, t-butyloxycarbonyl (Boc), and benzyloxycarbonyl (Cbz).

The term “pyrid-2-yl hydrazone,” as used herein, represents a group of the structure:

where each R′ is independently H or optionally substituted C₁₋₆ alkyl. Pyrid-2-yl hydrazone may be unsubstituted (i.e., each R′ is H).

The term “stereochemically enriched,” as used herein, refers to a local stereochemical preference for one stereoisomeric configuration of the recited group over the opposite stereoisomeric configuration of the same group. Thus, a polynucleotide containing a stereochemically enriched phosphorothioate is a strand, in which a phosphorothioate of predetermined stereochemistry is present in preference to a phosphorothioate of the opposite stereochemistry. This preference can be expressed numerically using a diastereomeric ratio for the phosphorothioate of the predetermined stereochemistry. The diastereomeric ratio for the phosphorothioate of the predetermined stereochemistry is the molar ratio of the diastereomers having the identified phosphorothioate with the predetermined stereochemistry relative to the diastereomers having the identified phosphorothioate with the opposite stereochemistry. The diastereomeric ratio for the phosphorothioate of the predetermined stereochemistry may be greater than or equal to 1.1 (e.g., greater than or equal to 4, greater than or equal to 9, greater than or equal to 19, or greater than or equal to 39).

The term “Q-tag,” as used herein, refers to a portion of a polypeptide containing glutamine residue that, upon transglutaminase-mediated reaction with a compound containing —NH₂ amine, provides a conjugate containing the portion of polypeptide, in which the glutamine residue includes a side chain modified to include the amide bonded to the compound. Q-tags are known in the art. Non-limiting examples of Q-tags are LLQGG and GGGLLQGG.

The term “strained cycloalkenyl,” as used herein, refers to a cycloalkenyl group that, if the open valency were substituted with H, has a ring strain energy of at least 16 kcal/mol.

The term “sugar analogue,” as used herein, represents a divalent or trivalent group that is a C₃₋₆ monosaccharide or C₃₋₆ alditol (e.g., glycerol), which is modified to replace two hydroxyl groups with bonds to the oxygen atoms in phosphate, phosphorothioate, or phosphorodithioate, or a capping group. A sugar analogue does not contain a nucleobase capable of engaging in hydrogen bonding with a nucleobase in a complementary strand. A sugar analogue is cyclic or acyclic. Further optional modifications included in a sugar analogue are: a replacement of one, two, or three of the remaining hydroxyl groups or carbon-bonded hydrogen atoms with H; optionally substituted C₁₋₆ alkyl; -LinkA(-T)_(p), as defined herein; a conjugating group; —(CH₂)_(t1)—OR^(Z), where t1 is an integer from 1 to 6, and R^(Z) is optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, optionally substituted C₂₋₆ alkynyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₃₋₈ cycloalkyl, optionally substituted (C₁₋₉ heterocyclyl)-C₁₋₆-alkyl, optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkyl, or optionally substituted (C₃₋₈ cycloalkyl)-C₁₋₆-alkyl; introduction of one or two unsaturation(s) (e.g., one or two double bonds); and replacement of one, two, or three hydrogens or hydroxyl groups with substituents as defined for alkyl, alkenyl, cycloalkyl, cycloalkenyl, or heterocyclyl. Non-limiting examples of sugar analogues are optionally substituted C₂₋₆ alkylene, optionally substituted C₂₋₆ alkenylene, optionally substituted C₅ cycloalkane-1,3-diyl, optionally substituted C₅ cycloalkene-1,3-diyl, optionally substituted heterocycle-1,3-diyl (e.g., optionally substituted pyrrolidine-2,5-diyl, optionally substituted tetrahydrofuran-2,5-diyl, or optionally substituted tetrahydrothiophene-2,5-diyl), or optionally substituted (C₁₋₄ alkyl)-(C₃₋₈ cycloalkylene) (e.g., optionally substituted (C₁ alkyl)-(C₃ cycloalkylene)).

The term “sulfide,” as used herein, represents a divalent —S— or ═S group. Disulfide is —S—S—.

The term “targeting moiety,” as used herein, represents a moiety (e.g., a small molecule, e.g., a carbohydrate) that specifically binds or reactively associates or complexes with a receptor or other receptive moiety associated with a given target cell population (e.g., an antigen-presenting cell (APC; e.g., a professional APC (e.g., B-cell, pDC, or macrophage))). A conjugate of the invention contains a targeting moiety. The targeting moiety can be an antibody or an antigen-binding fragment or an engineered derivative thereof (e.g., Fcab or a fusion protein (e.g., scFv)). The targeting moiety can be a polypeptide. Alternatively, the targeting moiety can be a small molecule (e.g., mannose) or a cluster of small molecules (e.g., a cluster of mannoses). A conjugate of the invention that includes the targeting moiety may exhibit K_(d) of less than 100 nM for the target, to which the targeting moiety bind. K_(d) is measured using methods known in the art, e.g., using surface plasmon resonance (SPR), e.g., using BIACORE™ system (GE Healthcare, Little Chalfont, the United Kingdom).

The term “1,2,4,5-tetrazine group,” as used herein, represents a group of the following formula

where R′ is optionally substituted alkyl, optionally substituted aryl, optionally substituted cycloalkyl, optionally substituted heterocyclyl; and R″ is optionally substituted alkylene, optionally substituted heteroalkylene, optionally substituted arylene, optionally substituted cycloalkylene, optionally substituted heterocyclylene, or a group —R^(a)—R^(b)—, in which each of R^(a) and R^(b) is independently optionally substituted alkylene, optionally substituted heteroalkylene, optionally substituted arylene, optionally substituted cycloalkylene, or optionally substituted heterocyclylene.

The term “therapeutic effect” refers to a local or systemic effect in a subject, particularly mammals, and more particularly humans, caused by a pharmacologically active substance. The term thus means any substance intended for use in the diagnosis, cure, mitigation, treatment or prevention of disease or in the enhancement of desirable physical or mental development and conditions in an animal or human. The term “therapeutically effective amount” or “therapeutically effective dose,” as used herein, represents the quantity of an immunomodulating polynucleotide or a conjugate necessary to ameliorate, treat, or at least partially arrest the symptoms of a disease to be treated. Amounts effective for this use depend on the severity of the disease and the weight and general state of the subject. Typically, dosages used in vitro may provide useful guidance in the amounts useful for in vivo administration of the pharmaceutical composition, and animal models may be used to determine effective dosages for treatment of a particular disease.

The term “thiocarbonyl,” as used herein, represents a C(═S) group.

The term “thioheterocyclylene,” as used herein, represents a group —S—R—, where R is heterocyclylene. Thioheterocyclylene may be optionally substituted in a manner described for heterocyclyl.

The term “thiol,” as used herein, represents an —SH group.

The term “treating” as used in reference to a disease or a condition in a patient, is intended to refer to obtaining beneficial or desired results, e.g., clinical results, in a patient by administering the polynucleotide or conjugate of the invention to the patient. Beneficial or desired results may include alleviation or amelioration of one or more symptoms of a disease or condition; diminishment of extent of a disease or condition; stabilization (i.e., not worsening) of a disease or condition; prevention of the spread of a disease or condition; delay or slowing the progress of a disease or condition; palliation of a disease or condition; and remission (whether partial or total). “Palliating” a disease or condition means that the extent and/or undesirable clinical manifestations of the disease or condition are lessened and/or time course of the progression is slowed, as compared to the extent or time course in the absence of the treatment with the polynucleotide or conjugate of the invention.

The term “triazolocycloalkenylene,” as used herein, refers to the heterocyclylenes containing a 1,2,3-triazole ring fused to an 8-membered ring, all of the endocyclic atoms of which are carbon atoms, and bridgehead atoms are sp²-hybridized carbon atoms. Triazocycloalkenylenes can be optionally substituted in a manner described for heterocyclyl.

The term “triazoloheterocyclylene,” as used herein, refers to the heterocyclylenes containing a 1,2,3-triazole ring fused to an 8-membered ring containing at least one heteroatom. The bridgehead atoms in triazoloheterocyclylene are carbon atoms. Triazoloheterocyclylenes can be optionally substituted in a manner described for heterocyclyl.

It is to be understood that the terms “immunomodulating polynucleotide,” “immunostimulating polynucleotide,” “immunosuppressive polynucleotide,” and “conjugate” encompass salts of the immunomodulating polynucleotide, immunostimulating polynucleotide, immunosuppressive polynucleotide and conjugate, respectively. For example, the terms “immunomodulating polynucleotide,” “immunostimulating polynucleotide,” “immunosuppressive polynucleotide,” and “conjugate” encompasses both the protonated, neutral form (P—XH moiety, where X is O or S) of a phosphate, phosphorothioate, or phosphorodithioate and the deprotonated, ionic form (P—X⁻ moiety, where X is O or S) of a phosphate, phosphorothioate, or phosphorodithioate. Accordingly, it is to be understood that the phosphoesters and phosphodiesters described as having one or more of R^(E1), R^(E2), and R^(E3) as hydrogen encompass salts, in which the phosphate, phosphorothioate, or phosphorodithioate is present in a deprotonated, ionic form.

The terms “innate immune response” and “innate immunity” are recognized in the art, and refer to non-specific defense mechanism a body's immune system initiates upon recognition of pathogen-associated molecular patterns, which involves different forms of cellular activities, including cytokine production and cell death through various pathways. As used herein, innate immune responses include cellular responses to a CpG-containing immunostimulating polynucleotide mediated by toll-like receptor 9 (TLR9), which include, without limitation, increased production of inflammation cytokines (e.g., type I interferon or IL-10 production), activation of the NFκB pathway, increased proliferation, maturation, differentiation and/or survival of immune cells, and in some cases, induction of cell apoptosis. Activation of the innate immunity can be detected using methods known in the art, such as measuring the (NF)-κB activation.

The terms “adaptive immune response” and “adaptive immunity” are recognized in the art, and refer to antigen-specific defense mechanism a body's immune system initiates upon recognition of a specific antigen, which include both humoral response and cell-mediated responses. As used herein, adaptive immune responses include cellular responses that is triggered and/or augmented by a CpG-containing immunostimulating polynucleotide. In some embodiments, the immunostimulating polynucleotide or a portion thereof is the antigen target of the antigen-specific adaptive immune response. In other embodiments, the immunostimulating polynucleotide is not the antigen target of the antigen-specific adaptive immune response, but nevertheless augments the adaptive immune response. Activation of an adaptive immune response can be detected using methods known in the art, such as measuring the antigen-specific antibody production, or the level of antigen-specific cell-mediated cytotoxicity.

The term “Toll-like receptor” (or “TLR”) is recognized in the art, and refers to a family of pattern recognition receptors that were initially identified as sensors of the innate immune system that recognize microbial pathogens. TLRs recognize distinct structures in microbes, often referred to as “PAMPs” (pathogen associated molecular patterns). Ligand binding to TLRs invokes a cascade of intra-cellular signaling pathways that induce an innate immune response and/or adaptive immune response. As used herein, the term “toll-like receptor” or “TLR” also refers to a functional fragment of a toll-like receptor protein expressed by a cell. In humans, ten TLRs have been identified, including TLR-1, -2, -3, -4, -5, -6, -7/8, and -9. D'Arpa and Leung, Adv. Wound Care, 6:330-343 (2017), the content of which is incorporated herein by reference in its entirety. Human genes encoding TLRs are known.

Toll-like receptor 9 (TLR9), also designated as CD289 (cluster of differentiation 289), is a member of the toll-like receptor (TLR) family. Du et al., Eur. Cytokine Netw., 11:362-371 (2000), the content of which is incorporated herein by reference in its entirety. TLR9 is an important receptor expressed in immune system cells including dendritic cells (DCs), B lymphocytes, macrophages, natural killer cells, and other antigen presenting cells. TLR9 activation triggers signaling cascades that bridges the innate and adaptive immunity. Martinez-Campos et al. Viral Immunol., 30:98-105 (2016); Notley et al., Sci. Rep., 7:42204 (2017); the content of each of which is incorporated herein by reference in its entirety. Natural TLR-9 agonists include unmethylated cytosine-guanine dinucleotide (CpG)-containing oligodeoxynucleotides (CpG ODNs). TLR-9 ligand finding use in the present disclosure include, but are not limited to, naturally existing or synthetic CpG ODNs, and other CpG-containing immunostimulating polynucleotide and/or immunoconjugates as provided herein. Activation of the TLR9 signaling pathway can be detected using methods known in the art, such as measuring recruitment of myeloid differentiation antigen 88 (MyD88), activation of nuclear factor (NF)-κB, c-Jun N-terminal kinase (JNK), and p38 mitogen-activated protein kinase (MAPK) signaling pathways, activation of interferon regulatory factor-7, expression level of one or more of cytokines such as type I interferons (IFNs), interleukin (IL)-6, IL-10, and IL-12, activation of one or more immune cell populations such as NK cells, natural killer T cells, monocytes, and level of cytotoxic lymphocyte (CTL) and T helper-1 (Th1) responses, and the level of immunoglobulin secretion.

The term “TLR-expressing cell” as used herein refers to a cell that expresses a toll-like receptor and is capable of activating the toll-like receptor signaling pathway upon binding of the toll-like receptor to an agonist. The toll-like receptor may be expressed on the cell surface, and/or on the membrane of one or more intracellular compartments of the cell, such as the endosome or phagosome. A TLR-expressing cell may further express one or more cell surface antigens other than the toll-like receptor. Certain immune cells express TLRs, and activation of the TLR signaling pathway in the immune cells elicits an innate immune response, and/or an adaptive immune response. Immune cells activated by the TLR signaling pathway can help eliminate other diseased cells from the body. Certain diseased cells (e.g., cancer cells or viral-infected cells) express TLRs, and activation of the TLR signaling pathway in the diseased cells can results in death of the diseased cell, such as via induced apoptosis. Examples of TLR9-expressing cells include but are not limited to dendritic cells (DCs), B cells, T cells, Langerhans cells, keratinocytes, mast cells, endothelial cells, myofibroblast cells, and primary fibroblast. Determining whether a cell expresses any toll-like receptor (e.g., TLR9) can be performed using methods known in the art, such as detecting mRNA of the toll-like receptor in a cell.

The term “immune cell” is recognized in the art, as used herein refers to any cell involved in a host defense mechanism, such as cells that produces pro-inflammatory cytokines, and cells that participate in tissue damage and/or disease pathogenesis. Examples of immune cells include, but are not limited to, T cells, B cells, natural killer cells, neutrophils, mast cells, macrophages, antigen-presenting cells (APC), basophils, and eosinophils.

The term “antigen presenting cell” or “APC” is recognized in the art, and refers to a heterogeneous group of immune cells that mediate the cellular immune response by processing and presenting antigens for recognition by certain lymphocytes such as T cells. Exemplary types of antigen presenting cells include, but are not limited to, professional antigen presenting cells including, for example, B cells, monocytes, dendritic cells, and Langerhans cells, as well as other antigen presenting cells including, for example, keratinocytes, endothelial cells, astrocytes, fibroblasts, and oligodendrocytes. As used herein, the term “antigen presenting cell” includes antigen presenting cells found in vivo and those found in in vitro cell cultures derived from the in vivo cells. As used herein, antigen presenting cells also include a APC that is artificially modified, such as genetically modified to express a toll-like receptor (e.g., TLR9) or to modulate expression level of a toll-like receptor (e.g., TLR9).

The term “dendritic cells” or “DC” is recognized in the art, and refers to a heterogeneous group of specialized antigen-sensing and antigen-presenting cells (APCs). Human DC are divided into three major subsets: plasmacytoid DC (pDC), myeloid DC (mDC) and monocyte-derived DC (MDDC). Schraml et al., Curr. Opin. Immunol., 32:13-20 (2015); the content of which is incorporated herein by reference in its entirety. Subsets of DCs can be identified on the basis of distinct TLR expression patterns. By way of an example, the myeloid or “conventional” subset of DC (mDC) expresses TLRs 1-8 when stimulated, and a cascade of activation markers (e.g. CD80, CD86, MHC class I and II, CCR7), pro-inflammatory cytokines, and chemokines are produced. A result of this stimulation and resulting expression is antigen-specific CD4+ and CD8+ T cell priming. These DCs acquire an enhanced capacity to take up antigens and present them in an appropriate form to T cells. The plasmacytoid subset of DC (pDC) expresses TLR7 and TLR9 upon activation, with a resulting activation of NK cells as well as T-cells.

The term “antigen” as used herein, refers to a molecule or an antigenic fragment thereof capable of eliciting an immune response, including both an innate immune response and an adaptive immune response. As used herein, antigens can be proteins, peptides, polysaccharides, lipids, nucleic acids, especially RNA and DNA, nucleotides, and other biological or biochemical substances. The term “elicit an immune response” refers to the stimulation of immune cells in vivo in response to a stimulus, such as an antigen. The immune response consists of both cellular immune response, e.g., T cell and macrophage stimulation, and humoral immune response, e.g., B cell and complement stimulation and antibody production. Immune response may be measured using techniques well-known in the art, including, but not limited to, antibody immunoassays, proliferation assays, and others.

The terms “antigenic fragment” and “antibody binding fragment” are used interchangeably herein. An antigenic fragment as used herein is able to complex with an antigen binding molecule, e.g., an antibody, in a specific reaction. The specific reaction referred to herein indicates that the antigen or antigenic fragment will react, in a highly selective manner, with its corresponding antibody and not with the multitude of other antibodies which may be evoked by other antigens. The specificity of such reaction is determined by the presence of one or more epitopes (immunogenic determinants) in the antigen. As used herein, an antigen or antigenic fragment thereof may have one epitope, or have more than one epitopes.

The term “T cell epitope” as used herein, refers to any epitopes of antigens produced by a T cell.

The term “tumor associated antigen” or “TAA”, as used herein, refers to an antigen expressed by a cancer cell or in the stroma of a solid tumor in a cancer patient receiving the treatment or preventive care as provided herein (e.g., receiving a therapeutic dose of an immunostimulating polynucleotide or a CpG-Ab immunoconjugate). The TAA may or may not be targeted in the treatment or the preventive care provided herein. The TAA does not have to be overexpressed, mutated or misregulated on cancer cell but can have same features as the TAA would have in a normal cell. In some embodiments, the TAA can be overexpressed, mutated or misregulated in cancer cell. The TAA can be a protein, nucleic acid, lipid or other antigen. The TAA can be a cell-surface expressed TAA, an intracellular TAA or an intranuclear TAA. In the context of a solid tumor, the TAA can be expressed in the stroma of a solid tumor mass. The term “stroma” as used herein refers to components in a solid tumor mass other than a cancer cell. For example, the stroma can include fibroblasts, epithelial cells, other blood vessel components or extracellular matrix components. As used herein, the term “stroma” does not include components of the immune system, such as immune cells (e.g., B-cells, T-cells, dendritic cells, macrophages, natural killer cells, and the like)). Various TAAs are known in the art. Identifying TAA can be performed using methods known in the art, such as disclosed in Zhang et al. Methods Mol. Biol., 520:1-10 (2009); the content of which is enclosed herein by reference.

The term “antibody” as used herein refers to a polypeptide of the immunoglobulin family that is capable of binding a corresponding antigen non-covalently, reversibly, and in a specific manner. For example, a naturally occurring IgG antibody is a tetramer comprising at least two heavy (H) chains and two light (L) chains inter-connected by disulfide bonds. Each heavy chain is comprised of a heavy chain variable region (abbreviated herein as VH) and a heavy chain constant region. The heavy chain constant region is comprised of three domains, CH1, CH2 and CH3. Each light chain is comprised of a light chain variable region (abbreviated herein as VL) and a light chain constant region. The light chain constant region is comprised of one domain, CL. The VH and VL regions can be further subdivided into regions of hyper variability, termed complementarity determining regions (CDR), interspersed with regions that are more conserved, termed framework regions (FR). Each VH and VL is composed of three CDRs and four FRs arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, and FR4. The variable regions of the heavy and light chains contain a binding domain that interacts with an antigen. The constant regions of the antibodies may mediate the binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (e.g., effector cells) and the first component (Clq) of the classical complement system.

As used herein, antibodies include, but are not limited to, monoclonal antibodies, human antibodies, humanized antibodies, camelid antibodies, chimeric antibodies, and anti-idiotypic (anti-Id) antibodies (including, e.g., anti-Id antibodies to antibodies of the invention). The antibodies can be of any isotype/class (e.g., IgG, IgE, IgM, IgD, IgA and IgY), or subclass (e.g., IgG1, IgG2, IgG3, IgG4, IgA1 and IgA2).

Both the light and heavy chains are divided into regions of structural and functional homology. The terms “constant” and “variable” are used functionally. In this regard, it will be appreciated that the variable domains of both the light (VL) and heavy (VH) chain portions determine antigen recognition and specificity. Conversely, the constant domains of the light chain (CL) and the heavy chain (CH1, CH2 or CH3) confer important biological properties such as secretion, transplacental mobility, Fc receptor binding, complement binding, and the like. By convention, the numbering of the constant region domains increases as they become more distal from the antigen binding site or amino-terminus of the antibody. The N-terminus is a variable region and at the C-terminus is a constant region; the CH3 and CL domains actually comprise the carboxy-terminal domains of the heavy and light chain, respectively.

As used herein, depending on the context, the term “antibody” may also refer to an antigen binding fragment of an antibody molecule. The term “antigen binding fragment”, as used herein, refers to one or more portions of an antibody that retain the ability to specifically interact with (e.g., by binding, steric hindrance, stabilizing/destabilizing, spatial distribution) an epitope of an antigen. Examples of binding fragments include, but are not limited to, single-chain Fvs (scFv), disulfide-linked Fvs (sdFv), Fab fragments, F(ab′) fragments, a monovalent fragment consisting of the VL, VH, CL and CH1 domains; a F(ab)2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; a Fd fragment consisting of the VH and CH1 domains; a Fv fragment consisting of the VL and VH domains of a single arm of an antibody; a dAb fragment (Ward et al. Nature, 341:544-546 (1989)), which consists of a VH or VL domain; a single domain antibody (VHH), and an isolated complementarity determining region (CDR), or other epitope-binding fragments of an antibody.

The term “specifically binds,” “selectively binds” or the like refers to a chemical interaction between two molecules, compounds, cells and/or particles wherein the first entity binds to the second, target entity with greater specificity and affinity than it binds to a third entity which is a non-target. In some embodiments, “specific binding” can refer to an affinity of the first entity for the second target entity which is at least 10 times, at least 50 times, at least 100 times, at least 500 times, at least 1000 times or greater than the affinity for the third non-target entity. In some embodiments, “specific binding” is used in the context of describing the interaction between an antigen (or an antigenic fragment thereof) and an antibody (or antigen-binding fragment thereof). In particular embodiments, “specific binding” refers to binding of the antibody to a predetermined antigen with a disassociation constant (KD) of 10⁻⁵ M or less, 10⁻⁶ M or less, or 10⁻⁷ M or less, or binding of an antibody to a predetermined antigen with a KD that is at least twofold less than its KD for binding to a nonspecific antigen other than the predetermined antigen. In some embodiments, specific binding can be used to determine the presence of the predetermined antigen in a heterogeneous population of proteins and other biologies, e.g., in a biological sample, e.g., a blood, serum, plasma or tissue sample. Thus, under certain designated immunoassay conditions, the antibodies or binding agents with a particular binding specificity bind to a particular antigen at least two times the background and do not substantially bind in a significant amount to other antigens present in the sample. In one embodiment, under designated immunoassay conditions, the antibody or binding agents with a particular binding specificity bind to a particular antigen at least two, three, four, five, six, seven, eight, nine or ten times the background and do not substantially bind in a significant amount to other antigens present in the sample. Specific binding to an antibody or binding agent under such conditions may require the antibody or agent to have been selected for its specificity for a particular protein. As desired or appropriate, this selection may be achieved by subtracting out antibodies that cross-react with molecules from other species (e.g., mouse or rat) or other subtypes. Alternatively, in some embodiments, antibodies or antibody fragments are selected that cross-react with certain desired molecules.

The term “cancer” or “tumor” refers to the presence of cells possessing characteristics typical of cancer-causing cells, such as uncontrolled proliferation, immortality, metastatic potential, rapid growth and proliferation rate, and certain characteristic morphological features. In some embodiments, such cells exhibit such characteristics in part or in full due to the expression and activity of immune checkpoint inhibitors, such as PD-1, PD-L1, and/or CTLA-4. Cancer cells are often in the form of a solid tumor, which is detectable on the basis of tumor mass, e.g., by procedures such as CAT scan, MR imaging, X-ray, ultrasound or palpation, and/or which is detectable because of the expression of one or more cancer-specific antigens in a sample obtainable from a patient. In some embodiments, a solid tumor does not need to have measurable dimensions. Cancer cells may also in the form of a liquid tumor, which cancer cells may exist alone or disseminated within an animal. As used herein, the terms “disseminated tumor” and “liquid tumor” are used interchangeably, and include, without limitation, leukemia and lymphoma and other blood cell cancers.

The term “leukemia” refers to a type of cancer of the blood or bone marrow characterized by an abnormal increase of immature white blood cells called “blasts.” Leukemia is a broad term covering a spectrum of diseases. In turn, it is part of the even broader group of diseases affecting the blood, bone marrow, and lymphoid system, which are all known as hematological neoplasms. Leukemias can be divided into four major classifications, acute lymphocytic (or lymphoblastic) leukemia (ALL), acute myelogenous (or myeloid or non-lymphatic) leukemia (AML), chronic lymphocytic leukemia (CLL), and chronic myelogenous leukemia (CML). Further types of leukemia include Hairy cell leukemia (HCL), T-cell prolymphocytic leukemia (T-PLL), large granular lymphocytic leukemia, and adult T-cell leukemia.

The term “lymphoma” refers to a group of blood cell tumors that develop from lymphatic cells. The two main categories of lymphomas are Hodgkin lymphomas (HL) and non-Hodgkin lymphomas (NHL) Lymphomas include any neoplasms of the lymphatic tissues. The main classes are cancers of the lymphocytes, a type of white blood cell that belongs to both the lymph and the blood and pervades both.

As used herein, the term “cancer” includes premalignant as well as malignant cancers, and also includes primary tumors (e.g., those whose cells have not migrated to sites in the subject's body other than the site of the original tumor) and secondary tumors (e.g., those arising from metastasis, the migration of tumor cells to secondary sites that are different from the site of the original tumor), recurrent cancer and refractory cancer.

The terms “cancer recurrence” and “cancer relapse” are used interchangeably and refer to the return of a sign, symptom or disease after a remission. The recurrent cancer cells may re-appear in the same site of the primary tumor or in another location, such as in secondary cancer. The cancer cells may re-appear in the same diseased form as the primary cancer or a different diseased form. For example, in some embodiments, a primary cancer is a solid tumor, and the recurrent cancer is a liquid tumor. In other embodiments, a primary cancer is a liquid tumor, and the recurrent cancer is a solid tumor. In yet other embodiments, the primary cancer and the recurrent cancer are both solid tumors, or both liquid tumors. In some embodiments, the recurrent tumor expresses at least one tumor associated antigen that is also expressed by the primary tumor.

The term “refractory cancer” as used herein refers to a cancer that does not respond to a treatment, for example, a cancer that is resistant at the beginning of treatment (e.g., treatment with an immunotherapy) or a cancer that may become resistant during treatment. The terms “respond,” “response” or “responsiveness” refer to an anti-cancer response, e.g. in the sense of reduction of tumor size or inhibiting tumor growth. The terms can also refer to an improved prognosis, for example, as reflected by an increased time to recurrence, which is the period to first recurrence censoring for second primary cancer as a first event or death without evidence of recurrence, or an increased overall survival, which is the period from treatment to death from any cause. To respond or to have a response means there is a beneficial endpoint attained when exposed to a stimulus. Alternatively, a negative or detrimental symptom is minimized, mitigated or attenuated on exposure to a stimulus. It will be appreciated that evaluating the likelihood that a tumor or subject will exhibit a favorable response is equivalent to evaluating the likelihood that the tumor or subject will not exhibit favorable response (i.e., will exhibit a lack of response or be non-responsive).

As used herein, cancers include, but are not limited to, B cell cancer, e.g., multiple myeloma, Waldenstrom's macroglobulinemia, the heavy chain diseases, such as, for example, alpha chain disease, gamma chain disease, and mu chain disease, benign monoclonal qammopathy, and immunocytic amyloidosis, melanomas, breast cancer, lung cancer, bronchus cancer, colorectal cancer, prostate cancer, pancreatic cancer, stomach cancer, ovarian cancer, urinary bladder cancer, brain or central nervous system cancer, peripheral nervous system cancer, esophageal cancer, cervical cancer, uterine or endometrial cancer, cancer of the oral cavity or pharynx, liver cancer, kidney cancer, testicular cancer, biliary tract cancer, small bowel or appendix cancer, salivary gland cancer, thyroid gland cancer, adrenal gland cancer, osteosarcoma, chondrosarcoma, cancer of hematologic tissues, and the like. Other non-limiting examples of types of cancers applicable to the methods encompassed by the present invention include human sarcomas and carcinomas, e.g., fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon carcinoma, colorectal cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, liver cancer, choriocarcinoma, sominoma, embryonal carcinoma, Wilms' tumor, cervical cancer, bone cancer, brain tumor, testicular cancer, lung carcinoma, small cell lung carcinoma, bladder carcinoma, epithelial carcinoma, glioma, astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, melanoma, neuroblastoma, retinoblastoma; leukemias, e.g., acute lymphocytic leukemia and acute myelocytic leukemia (myeloblastic, promyelocytic, myelomonocytic, monocytic and erythroleukemia); chronic leukemia (chronic myelocytic (granulocytic) leukemia and chronic lymphocytic leukemia); and polycythemia vera, lymphoma (Hodgkin's disease and non-Hodgkin's disease), multiple myeloma, Waldenstrom's macroglobulinemia, and heavy chain disease. In some embodiments, cancers are epithlelial in nature and include but are not limited to, bladder cancer, breast cancer, cervical cancer, colon cancer, gynecologic cancers, renal cancer, laryngeal cancer, lung cancer, oral cancer, head and neck cancer, ovarian cancer, pancreatic cancer, prostate cancer, or skin cancer. In other embodiments, the cancer is breast cancer, prostate cancer, lung cancer, or colon cancer. In still other embodiments, the epithelial cancer is non-small-cell lung cancer, nonpapillary renal cell carcinoma, cervical carcinoma, ovarian carcinoma (e.g., serous ovarian carcinoma), or breast carcinoma. The epithelial cancers may be characterized in various other ways including, but not limited to, serous, endometrioid, mucinous, clear cell, Brenner, or undifferentiated.

The term “cancer therapy” or “cancer therapeutic agent” as used herein, refers to those therapies or agents that can exert anti-tumor effect or have an anti-tumor activity. Such anti-tumor effect or anti-tumor activity can be exhibited as a reduction in the rate of tumor cell proliferation, viability, or metastatic activity. A possible way of showing anti-tumor activity is to show a decline in growth rate of abnormal cells that arises during therapy or tumor size stability or reduction. Such activity can be assessed using accepted in vitro or in vivo tumor models, including but not limited to xenograft models, allograft models, MMTV models, and other known models known in the art to investigate anti-tumor activity.

As used herein, the term “prevent”, “preventing” or “prevention” of any disease or disorder means the prevention of the onset, recurrence or spread, in whole or in part, of the disease or condition as described herein, or a symptom thereof.

As used herein, a subject is “in need of” a treatment if such subject would benefit biologically, medically or in quality of life from such treatment.

The term “therapeutic agent” is art-re cognized and refers to any substance that, upon administration to a subject in need thereof, is biologically, physiologically, or pharmacologically active, and acts locally or systemically to exert a beneficial therapeutic effect to the subject.

The term “immunoconjugate” or “antibody-drug-conjugate (ADC)” as used herein refers to the linkage of an antigen binding moiety (e.g., an antibody or an antigen binding fragment thereof) with an immunomodulatory polynucleotide as described herein. The linkage can be covalent bonds, or non-covalent interactions, and can include chelation. Various linkers, known in the art or provided herein, can be employed in order to form the immunoconjugate. In some embodiments, the immunoconjugate is a conjugate of Formula (C) as provided herein.

The term “antigen binding moiety” as used herein refers to a moiety capable of binding specifically to an antigen, and includes but is not limited to antibodies and antigen binding fragments.

The term “CpG-Ab immunoconjugate” or “CpG-Ab” as used herein refers to the linkage of an antibody (Ab) or an antigen binding fragment thereof with a CpG-containing immunostimulating polynucleotide as described herein.

The term “T-cell agonist” as used herein refers to any agent that selectively stimulates the proliferation, differentiation, and/or survival of T cells from a mixed starting population of cells. Thus, the resulting cell population is enriched with an increased number of T cells compared with the starting population of cells. T cell agonists finding use in the present disclosure include but are not limited to antigen molecules specifically binding to T cell receptors (TCRs), as well as T cell co-stimulatory molecules. Examples of T cell co-stimulatory molecules includes but are not limited to OX40, CD2, CD27, CDS, ICAM-1, LFA-1 (CD11a/CD18), ICOS (CD278), 4-1BB (CD137), GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3 and CD83 ligand. In particular embodiments, the T-cell agonist is an antibody against a T cell co-stimulatory molecule. In particular embodiments, the T cell agonist is a tumor associated antigen (TAA). In particular embodiments, the T cell agonist is a pathogenic antigen.

As used herein, an “immune checkpoint” or “immune checkpoint molecule” is a molecule in the immune system that modulates a signal. An immune checkpoint molecule can be a stimulatory checkpoint molecule, i.e., turn up a signal, or inhibitory checkpoint molecule, i.e., turn down a signal. In specific embodiments, immune checkpoint is a protein expressed either by T cells or by antigen presenting cells (APC). Certain types of cancer cells express immune checkpoint proteins to evade immune clearance. Use of immune checkpoint modulators to inhibit the interaction between the immune checkpoint protein expressed by cancer cells and the immune checkpoint protein expressed by T cells has proved effective in certain cancer treatment.

As used herein, an “immune checkpoint modulator” is an agent capable of altering the activity of an immune checkpoint in a subject. In certain embodiments, an immune checkpoint modulator alters the function of one or more immune checkpoint molecules including, but not limited to, PD-1, PD-L1, PD-L2, TIM-3, LAG-3, CEACAM-1, CEACAM-5, VISTA, BTLA, TIGIT, LAIR1, CD160, CD47, 2B4 and TGFR. The immune checkpoint modulator may be an agonist or an antagonist of the immune checkpoint. In some embodiments, the immune checkpoint modulator is an immune checkpoint binding protein (e.g., an antibody, antibody Fab fragment, divalent antibody, antibody drug conjugate, scFv, fusion protein, bivalent antibody, or tetravalent antibody). In other embodiments, the immune checkpoint modulator is a small molecule. In a particular embodiment, the immune checkpoint modulator is an anti-PDI or an anti-PD-LI antibody.

The term “targeted delivery” or the verb form “target” as used herein refers to the process that promotes the arrival of a delivered agent (such as an immunostimulating polynucleotide) at a specific organ, tissue, cell and/or intracellular compartment (referred to as the targeted location) more than any other organ, tissue, cell or intracellular compartment (referred to as the non-target location). Targeted delivery can be detected using methods known in the art, for example, by comparing the concentration of the delivered agent in a targeted cell population with the concentration of the delivered agent at a non-target cell population after systemic administration. As provided herein, targeted delivery results in at least 2 fold higher concentration at a targeted location as compared to a non-target location. Targeted delivery may be achieved by specific binding of the targeting moiety to an receiving moiety associated with a targeted cell. As used herein, an receiving moiety associated with a targeted cell may be located on the surface or within the cytosol of the targeted cell. In some embodiments, the receiving moiety is an antigen associated with the targeted cell.

The term “abnormal” when used in the context of organisms, tissues, cells or components thereof, refers to those organisms, tissues, cells or components thereof that differ in at least one observable or detectable characteristic (e.g., age, treatment, time of day, etc.) from those organisms, tissues, cells or components thereof that display the “normal” (expected) respective characteristic. Characteristics which are normal or expected for one cell or tissue type, might be abnormal for a different cell or tissue type. In some embodiments, an abnormal cell is a cancer cell.

The term “combination therapy” refers to the administration of two or more therapeutic agents to treat a condition or disorder (e.g., cancer) described in the present disclosure. Such administration encompasses co-administration of these therapeutic agents in a substantially simultaneous manner, such as administering a single formulation having a fixed ratio of therapeutic agents or in separate formulations (e.g., capsules and/or intravenous formulations) for each therapeutic agent. In addition, such administration also encompasses use of each type of therapeutic agent in a sequential or separate manner, either at approximately the same time or at different times. Such administration also encompasses each component being formulated as a separate formulation that can be administered at different times and/or through different administration routes. In any case, the treatment regimen of the combination therapy will provide beneficial therapeutic effects in treating the conditions or disorders described herein.

As used herein, the term “co-administering,” or “co-administration,” and the like refers to the act of administering two or more therapeutic agents (e.g., an immunoconjugate and an immune checkpoint modulator), compounds, therapies, or the like, at or about the same time. Co-administering may refer to simultaneous administration, where the different therapeutic agents of the present disclosure, e.g., an immunoconjugate, T cell agonists, immune checkpoint modulators, or other chemotherapeutics, may be combined into the same formulation, or formulated separately for simultaneous administration to a subject. Co-administering may also refer to sequential administration. The order or sequence of administering the different therapeutic agents of the invention, e.g., an immunoconjugate, T cell agonists, immune checkpoint modulators, or other chemotherapeutics may vary and is not confined to any particular sequence. Co-administering may also refer to the situation where two or more agents are administered to different regions of the body or via different delivery schemes, e.g., where a first agent is administered systemically and a second agent is administered intratumorally, or where a first agent is administered intratumorally and a second agent is administering systemically into the blood or proximally to the tumor. Co-administering may also refer to two or more agents administered via the same delivery scheme, e.g., where a first agent is administered intratumorally and a second agent is administered intratumorally.

“Intratumoral injection” refers to administration of an agent as provided herein directly into the tumor cellular mass and/or the tumor microenvironment. As used herein, tumor microenvironment includes the neoplasia milieu that creates a structural and/or functional environment for the neoplastic process to survive, expand, or spread. A tumor microenvironment is constituted by the cells, molecules, fibroblasts, extracellular matrix and blood vessels that surround and feed one or more neoplastic cells forming the tumor. Examples of cells or tissues in the tumor microenvironment include, but are not limited to, tumor vasculature, tumor infiltrating lymphocytes, fibroblast reticular cells, endothelial progenitor cells (EPC), cancer-associated fibroblasts, pericytes, other stromal cells, components of the extracellular matrix (ECM), dendritic cells, antigen presenting cells, T-cells, regulatory T-cells, macrophages, neutrophils, and other immune cells located proximal to a tumor. Examples of cellular functions affecting the tumor microenvironment include, but are not limited to, production of cytokines and/or chemokines, response to cytokines, antigen processing and presentation of peptide antigen, regulation of leukocyte chemotaxis and migration, regulation of gene expression, complement activation, regulation of signaling pathways, cell-mediated cytotoxicity, cell-mediated immunity, humoral immune responses, and other innate or adaptive immune responses. Measuring the effect of modulating of these cellular functions

The terms “subject,” “patient,” “individual” and the like are used interchangeably herein, and refer to any animal or cells thereof whether in vitro or in vivo, amendable to the methods provided herein. In certain non-limiting embodiments, the patient, subject or individual is a mammal, such as a human, or other animals, such as wild animals (such as herons, storks, cranes, etc.), livestock (such as ducks, geese, etc.) or experimental animals (such as orangutans, monkeys, rats, mice, rabbits, guinea pigs, marmots, ground squirrels, etc.).

The term “survival” as used in the context of cancer includes any of the following: survival until mortality, also known as overall survival (wherein said mortality may be either irrespective of cause or tumor related); “recurrence-free survival” (wherein the term recurrence shall include both localized and distant recurrence); metastasis free survival; disease free survival (wherein the term disease shall include cancer and diseases associated therewith). The length of said survival may be calculated by reference to a defined start point (e.g. time of diagnosis or start of treatment) and end point (e.g. death, recurrence or metastasis). In addition, criteria for efficacy of treatment can be expanded to include response to chemotherapy, probability of survival, probability of metastasis within a given time period, and probability of tumor recurrence.

The invention provides immunomodulating (e.g., immunostimulating) polynucleotides and conjugates containing a targeting moiety and one or more immunomodulating (e.g., immunostimulating) polynucleotides. The immunomodulating polynucleotides may contain a 5-modified uridine or 5-modified cytidine. The inclusion of 5-modified uridine (e.g., 5-ethynyl-uridine) at the 5′-terminus of the immunomodulating polynucleotides (e.g., among the two 5′-terminal nucleosides) may enhance the immunomodulating properties of the polynucleotides. The immunomodulating polynucleotides may be shorter (e.g., contain a total of from 6 to 16 nucleotides or from 12 to 14 nucleotides) than typical CpG ODNs, which are 18 to 28 nucleotides in length. The shorter immunomodulating polynucleotides of the invention (e.g., those containing a total of from 6 to 16 nucleotides or from 12 to 14 nucleotides) may retain immunomodulating activity of the longer, typical CpG ODNs and may exhibit higher immunomodulating activity (e.g., as measured by NFκB activation or by the changes in the expression levels of at least one cytokine (e.g., IL-6 or IL-10), as compared to longer CpG ODNs. Advantageously, the shorter immunomodulating polynucleotides are easier and more economical to prepare, as their synthesis would involve fewer polynucleotide synthesis steps than the synthesis of a full length, typical CpG ODN. The immunomodulating polynucleotides may contain one or more abasic spacers and/or internucleoside phosphotriesters.

The immunomodulating polynucleotides of the invention may exhibit stability (e.g., stability against nucleases) that is superior to that of CpG ODNs containing mostly internucleoside phosphate (e.g., more than 50% of internucleoside phosphates) without substantially sacrificing their immunostimulating activity. This effect can be achieved, e.g., by incorporating at least 50% (e.g., at least 70%) internucleoside phosphorothioates or phosphorodithioates or through the inclusion of internucleoside phosphotriesters and/or internucleoside abasic spacers. Phosphotriesters and abasic spacers are also convenient for conjugation to a targeting moiety. Phosphate-based phosphotriesters and abasic spacers may also be used for reduction of off-target activity, relative to polynucleotides with fully phosphorothioate backbones. Without wishing to be bound by theory, this effect may be achieved by reducing self-delivery without disrupting targeting moiety-mediated delivery to target cells. Accordingly, a polynucleotide of the invention can include 15 or fewer contiguous internucleoside phosphorothioates (e.g., 14 or fewer, 13 or fewer, 12 or fewer, 11 or fewer, or 10 or fewer contiguous internucleoside phosphorothioates). For example, an immunostimulating polynucleotide containing a total of from 12 to 16 nucleosides may contain 10 or fewer contiguous internucleoside phosphorothioates.

The immunostimulating polynucleotide of the invention can contain a total of 50 or fewer nucleosides (e.g., 30 or fewer, 28 or fewer, or 16 or fewer nucleosides). The immunostimulating polynucleotide of the invention can contain a total of at least 6 nucleosides (e.g., 10 or more or 12 or more nucleosides). For example, the immunostimulating polynucleotide of the invention can contain a total of from 6 to 30 nucleosides (e.g., a total of from 6 to 28 nucleosides, a total of from 6 to 20 nucleosides, a total of from 6 to 16 nucleosides, a total of from 10 to 20 nucleosides, a total of from 10 to 16 nucleosides, a total of from 12 to 28 nucleosides, a total of from 12 to 20 nucleosides, or a total of from 12 to 16 nucleosides).

The immunostimulating polynucleotide the invention can include one or more phosphotriesters (e.g., internucleoside phosphotriesters) and/or phosphorothioates (e.g., from 1 to 6 or from 1 to 4), e.g., at one or both termini (e.g., within the six 5′-terminal nucleosides or the six 3′-terminal nucleosides). The inclusion of one or more internucleoside phosphotriesters and/or phosphorothioates can enhance the stability of the polynucleotide by reducing the rate of exonuclease-mediated degradation.

In certain embodiments, the immunostimulating polynucleotide of the invention contains a phosphotriester or a terminal phosphodiester, where the phosphotriester or the terminal phosphodiester includes a linker bonded to a targeting moiety or a conjugating group and optionally to one or more (e.g., 1 to 6) auxiliary moieties. In particular embodiments, the immunostimulating polynucleotide contains only one linker. In some embodiments, the immunostimulating polynucleotide contains only one conjugating group.

The polynucleotide of the invention (e.g., immunostimulating polynucleotide) can be a hybridized polynucleotide including a strand and its partial or whole complement. The hybridized polynucleotides can have at least 6 complementary base pairings (e.g., 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23), up to the total number of the nucleotides present in the included shorter strand. For example, the hybridized portion of the hybridized polynucleotide may contain 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23 base pairs.

Conjugates of the invention contain a targeting moiety and one or more immunomodulating (e.g., immunostimulating) polynucleotides (e.g., from 1 to 6 or from 1 to 4 (e.g., 1 or 2) immunomodulating (e.g., immunostimulating) polynucleotides). In the conjugates, each of the immunomodulating polynucleotides includes independently a linker. A targeting moiety is covalently bonded to the linker. The linker may be bonded to a nucleobase, abasic spacer, phosphate, phosphorothioate, or phosphorodithioate in the immunomodulating polynucleotide. The cells targeted by the conjugates of the invention are professional APCs (e.g., B cells, pDCs, or macrophages). The targeting moiety can be an antigen-binding moiety (e.g., an antibody or antigen-binding fragment thereof), a polypeptide, an aptamer, or a group including one or more small molecules (e.g., mannose). In the conjugates of the invention, a targeting moiety may be an antibody or an antibody fragment. A conjugate of the invention can contain an antibody or an antibody fragment and one or more immunomodulating polynucleotides covalently linked to a Q-tag in the antibody or the antibody fragment. The Q-tag may be N-terminal or C-terminal. The Q-tag may be disposed in the heavy or light chain of the antibody or the antibody fragment. The use of targeting moiety-based delivery of the immunomodulating polynucleotides of the invention to specifically targeted tissues and cells may overcome the disadvantages of the typically uneven distribution of immunomodulating polynucleotides in vivo. Further, the targeting moiety-based delivery of the immunomodulating polynucleotides of the invention may be advantageous to systemic administration or to administration to a target tissue of immunomodulating polynucleotides, as systemic administration and the administration to a target tissue may produce an undesirable distribution of the immunomodulating polynucleotides through blood circulation in vivo, whereas a conjugate of the invention may undergo the intracellular delivery predominantly at the target tissue or cells, even when systemically administered. The distribution-related advantages may be particularly pronounced in conjugates containing short immunomodulating polynucleotide(s) (e.g., immunomodulating polynucleotides containing a total of 6 to 16 nucleosides (e.g., a total of 10 to 16 or 12 to 16 nucleosides)).

The conjugates of the invention may further contain one or more (e.g., from 1 to 6) auxiliary moieties (e.g., polyethylene glycols (PEGs)). The auxiliary moiety may be a part of a capping group, bioreversible group, or non-bioreversible group. The auxiliary moieties may be bonded to the linkers (e.g., to the linkers bonded to phosphates, phosphorothioates, or phosphorodithioates in the immunomodulating (e.g., immunostimulating) polynucleotides). Inclusion of the auxiliary moieties (e.g., PEGs) in the conjugates of the invention may improve pharmacokinetic and/or biodistribution properties of the conjugates relative to a reference conjugate lacking such auxiliary moieties.

One or more of the immunomodulating polynucleotides of the invention can be conjugated to a targeting moiety (e.g., an antigen-binding moiety) that targets an antigen-presenting cell (APC; e.g., a professional APC (e.g., B-cell, pDC, or macrophage)). Delivery of the immunomodulating polynucleotides of the invention or conjugates of the invention to a cell (e.g., an antigen-presenting cell (APC; e.g., a professional APC (e.g., B-cell, pDC, or macrophage))) containing an endosomal toll-like receptor (e.g., TLR9) may be used to agonize (for immunostimulating polynucleotides) or antagonize (for immune suppressive polynucleotides) the endosomal toll-like receptor in the cell. Without being bound by theory, activation of an endosomal toll-like receptor can induce proinflammatory cytokines (e.g., IL-6, IL-10, and/or type I interferon); this activity is believed to be useful for the treatment of various tumors (e.g., solid and liquid tumors in a patient).

In one embodiment, provided herein is an oligonucleotide of Formula (A): X^(5′)—(X^(N))_(b)—Y^(P)—(X^(N))_(C)—X^(3′)  (A) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

each X^(N) is independently a nucleotide;

X^(3′) is a 3′ terminal nucleotide;

X^(5′) is a 5′ terminal nucleotide;

Y^(P) is an internucleoside phosphotriester; and

b and c are each an integer ranging from about 0 to about 25; with the proviso that their sum is no less than 5;

wherein the oligonucleotide comprises a nucleotide with a modified nucleobase.

In certain embodiments, b is an integer ranging from about 1 to about 15. In certain embodiments, b is an integer of about 1, about 2, about 3, about 4, about 5, about 6, about 7, about 8, about 9, about 10, about 11, about 12, about 13, about 14, or about 15. In certain embodiments, b is an integer of about 3, about 4, about 11, or about 14. In certain embodiments, b is an integer of about 3. In certain embodiments, b is an integer of about 4. In certain embodiments, b is an integer of about 11. In certain embodiments, b is an integer of about 14.

In certain embodiments, c is an integer ranging from about 0 to about 10. In certain embodiments, c is an integer of about 0, about 1, about 2, about 3, about 4, about 5, about 6, about 7, about 8, about 9, or about 10. In certain embodiments, c is an integer of about 0 or about 8. In certain embodiments, c is an integer of about 0. In certain embodiments, c is an integer of about 8.

In certain embodiments, b is an integer of about 3 and c is an integer of about 8. In certain embodiments, b is an integer of about 4 and c is an integer of about 8. In certain embodiments, b is an integer of about 11 and c is an integer of about 0. In certain embodiments, b is an integer of about 14 and c is an integer of about 0.

In certain embodiments, b and c together in total are ranging from about 5 to about 20. In certain embodiments, b and c together in total ranging from about 5 to about 15. In certain embodiments, b and c together in total are about 5, about 6, about 7, about 8, about 9, about 10, about 11, about 12, about 13, about 14, or about 15. In certain embodiments, b and c together in total are about 8, about 9, about 10, about 11, about 12, about 13, or about 14. In certain embodiments, b and c together in total are about 11. In certain embodiments, b and c together in total are about 12. In certain embodiments, b and c together in total are about 14.

In certain embodiments, each X^(N) is independently a 2′-deoxyribonucleotide or a 23-modified ribonucleotide. In certain embodiments, each X^(N) is independently 2′-deoxyadenosine (A), 23-deoxyguanosine (G), 2′-deoxycytidine (C), a 5-halo-2′-deoxycytidine, 2′-deoxythymidine (T), 23-deoxyuridine (U), a 5-halo-2′-deoxyuridine, a 2′-fluororibonucleotide, a 2′-methoxyribonucleotide, or a 23-(2-methoxyethoxy)ribonucleotide. In certain embodiments, each X^(N) is independently a 23-deoxyribonucleotide. In certain embodiments, each X^(N) is independently 2′-deoxyadenosine, 23-deoxyguanosine, 2′-deoxycytidine, a 5-halo-2′-deoxycytidine, 2′-deoxythymidine, 2′-deoxyuridine, or a 5-halo-2′-deoxyuridine. In certain embodiments, each X^(N) is each X^(N) is independently 2′-deoxyadenosine, 2′-deoxyguanosine, 2′-deoxycytidine, 2′-deoxythymidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine.

In certain embodiments, X^(3′) is a 2′-deoxyribonucleotide or a 2′-modified ribonucleotide. In certain embodiments, X^(3′) is a 2′-deoxyribonucleotide. In certain embodiments, X^(3′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 2′-deoxycytidine, a 5-halo-2′-deoxycytidine, 2′-deoxythymidine, 2′-deoxyuridine, a 5-halo-2′-deoxyuridine, a 2′-fluororibonucleotide, a 2′-methoxyribonucleotide, or a 2′-(2-methoxyethoxy)ribonucleotide. In certain embodiments, X^(3′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 23-deoxycytidine, a 5-halo-2′-deoxycytidine, 2′-deoxythymidine, 2′-deoxyuridine, or a 5-halo-2′-deoxyuridine. In certain embodiments, X^(3′) is 2′-deoxythymidine. In certain embodiments, X^(3′) is a 2′-deoxyribonucleotide with a substituted pyrimidine base. In certain embodiments, X^(3′) is a 2′-deoxyribonucleotide with a 5-substituted pyrimidine base. In certain embodiments, X^(3′) is 2′-deoxythymidine, a 5-halo-2′-deoxycytidine, or a 5-halo-2′-deoxyuridine. In certain embodiments, X^(3′) is 2′-deoxythymidine, 5-bromo-2′-deoxycytidine, 5-iodo-2′-deoxycytidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine. In certain embodiments, X^(3′) is 2′-deoxythymidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine. In certain embodiments, X^(3′) is a terminal nucleotide comprising a 3′ capping group. In certain embodiments, the 3′ capping group is a terminal phosphoester. In certain embodiments, the 3′ capping group is 3-hydroxyl-propylphosphoryl (i.e., —P(O₂)—CH₂CH₂CH₂OH).

In certain embodiments, X^(5′) is a 2′-deoxyribonucleotide or a 2′-modified ribonucleotide. In certain embodiments, X^(5′) is a 2′-deoxyribonucleotide. In certain embodiments, X^(5′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 2′-deoxycytidine, a 5-halo-2′-deoxycytidine, 2′-deoxythymidine, 2′-deoxyuridine, a 5-halo-2′-deoxyuridine, a 2′-fluororibonucleotide, a 2′-methoxyribonucleotide, or a 2′-(2-methoxyethoxy)ribonucleotide. In certain embodiments, X^(5′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 23-deoxycytidine, a 5-halo-2′-deoxycytidine, 2′-deoxythymidine, 2′-deoxyuridine, or a 5-halo-2′-deoxyuridine. In certain embodiments, X^(5′) is a 2′-deoxyribonucleotide with a substituted pyrimidine base. In certain embodiments, X^(5′) is a 2′-deoxyribonucleotide with a 5-substituted pyrimidine base. In certain embodiments, X^(5′) is 2′-deoxythymidine, a 5-halo-2′-deoxycytidine, or a 5-halo-2′-deoxyuridine. In certain embodiments, X^(5′) is a 5-halo-2′-deoxycytidine. In certain embodiments, X^(5′) is a 5-halo-2′-deoxyuridine. In certain embodiments, X^(5′) is 2′-deoxythymidine, 5-bromo-2′-deoxycytidine, 5-iodo-2′-deoxycytidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine. In certain embodiments, X^(5′) is 2′-deoxythymidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine. In certain embodiments, X^(5′) is 5-bromo-2′-deoxyuridine. In certain embodiments, X^(5′) is 5-iodo-2′-deoxyuridine. In certain embodiments, X^(5′) has a 3′-phosphorothoate group. In certain embodiments, X^(5′) has a 3′-phosphorothoate group with a chirality of Rp. In certain embodiments, X^(5′) has a 3′-phosphorothoate group with a chirality of Sp.

In certain embodiments, Y^(P) is an internucleoside phosphothiotriester.

In certain embodiments, Y^(P) is:

wherein Z is O or S; and d is an integer ranging from about 0 to about 50. In certain embodiments, Z is O. In certain embodiments, Z is S. In certain embodiments, d is an integer ranging from about 0 to about 10. In certain embodiments, d is an integer ranging from about 0 to about 5. In certain embodiments, d is an integer of about 0, about 1, about 2, about 3, about 4, or about 5. In certain embodiments, d is an integer of about 0, about 1, or about 3.

In certain embodiments, Y^(P) is:

wherein Z is O or S; and d is an integer ranging from about 0 to about 50. In certain embodiments, Z is O. In certain embodiments, Z is S. In certain embodiments, d is an integer ranging from about 0 to about 10. In certain embodiments, d is an integer ranging from about 0 to about 5. In certain embodiments, d is an integer of about 0, about 1, about 2, about 3, about 4, or about 5. In certain embodiments, d is an integer of about 0, about 1, or about 3.

In certain embodiments, the oligonucleotide of Formula (A) comprises one additional internucleoside phosphotriester. In one embodiment, the additional internucleoside phosphotriester is a C₁₋₆ alkylphosphotriester. In another embodiment, the additional internucleoside phosphotriester is ethylphosphotriester.

In certain embodiments, the oligonucleotide of Formula (A) comprises one 5-halo-2′-deoxyuridine. In one embodiment, the 5-halo-2′-deoxyuridine is 5-fluoro-2′-deoxyuridine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine. In another embodiment, the 5-halo-2′-deoxyuridine is 5-bromo-2′-deoxyuridine or 5-iodo-2′-deoxyuridine. In yet another embodiment, the 5-halo-2′-deoxyuridine is 5-fluoro-2′-deoxyuridine. In yet another embodiment, the 5-halo-2′-deoxyuridine is 5-bromo-2′-deoxyuridine. In still another embodiment, the 5-halo-2′-deoxyuridine is 5-iodo-2′-deoxyuridine.

In certain embodiments, the oligonucleotide of Formula (A) comprises three or more 2′-deoxycytidines. In certain embodiments, the oligonucleotide of Formula (A) comprises three 23-deoxycytidines.

In certain embodiments, the oligonucleotide of Formula (A) comprises four or more 2′-deoxyguanosines. In certain embodiments, the oligonucleotide of Formula (A) comprises four 2′-deoxyguanosines.

In certain embodiments, the oligonucleotide of Formula (A) comprises three 2′-deoxycytidines and four 2′-deoxyguanosines. In certain embodiments, the oligonucleotide of Formula (A) comprises one, two, or three CG dinucleotides. In certain embodiments, the oligonucleotide of Formula (A) comprises three CG dinucleotides.

In certain embodiments, the oligonucleotide of Formula (A) comprises three or more 2′-deoxythymidines. In certain embodiments, the oligonucleotide of Formula (A) comprises three, four, five, six, seven, or eight 2′-deoxythymidines. In certain embodiments, the oligonucleotide of Formula (A) comprises three, four, five, or eight 2′-deoxythymidines.

In certain embodiments, the oligonucleotide of Formula (A) does not comprise a 23-deoxyadenosine. In certain embodiments, the oligonucleotide of Formula (A) comprises one or two 23-deoxyadenosines.

In certain embodiments, the oligonucleotide of Formula (A) has a length ranging from about 5 to about 20 or from about 6 to about 15 nucleotides. In certain embodiments, the oligonucleotide of Formula (A) has a length of about 6, about 7, about 8, about 9, about 10, about 11, about 12, about 13, about 14, or about 15. In certain embodiments, the oligonucleotide of Formula (A) has a length of about 10, about 11, about 12, about 13, about 14, or about 15.

In certain embodiments, the oligonucleotide of Formula (A) comprises one or more internucleoside phosphorothioates. In certain embodiments, all the internucleoside phosphoesters in the oligonucleotide of Formula (A) are internucleoside phosphorothioates. In certain embodiments, the oligonucleotide of Formula (A) comprises one or more chiral internucleoside phosphorothioates.

In certain embodiments, the oligonucleotide of Formula (A) is p275, p276, p313, or p347. In certain embodiments, the oligonucleotide of Formula (A) is p236, p238, p243, p246, p308, p361, p362, or p425. In certain embodiments, the oligonucleotide of Formula (A) is p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488, or p489.

In certain embodiments, the oligonucleotide of Formula (A) is an immunomodulating oligonucleotide.

In one embodiment, provided herein is an oligonucleotide having a sequence of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

x is an integer ranging from 1 to 4;

N¹ is absent or 2′-deoxythymidine;

N² is a 2′-deoxyribonucleotide with a modified nucleobase;

N³ is 2′-deoxyadenosine or 2′-deoxythymidine, each optionally comprising a 3′-phosphotriester;

N⁴ is 2′-deoxyadenosine or 2′-deoxythymidine;

N⁵ is 2′-deoxythymidine optionally comprising a 3′-phosphotriester; and

C is 2′-deoxycytidine and G is 2′-deoxyguanosine.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), x is an integer of 1, 2, 3, or 4. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), x is an integer of 1. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), x is an integer of 4.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N¹ is absent. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N¹ is 2′-deoxythymidine.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N² is a 2′-deoxyribonucleotide with a substituted pyrimidine base. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N² is a 2′-deoxyribonucleotide with a 5-substituted pyrimidine base. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N² is a 5-halo-2′-deoxycytidine or a 5-halo-2′-deoxyuridine. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N² is 5-bromo-2′-deoxyuridine or 5-iodo-2′-deoxyuridine.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N³ is 2′-deoxyadenosine comprising a 3′-phosphotriester. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N³ is 2′-deoxythymidine. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N³ is 2′-deoxythymidine comprising a 3′-phosphotriester.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N⁴ is 2′-deoxyadenosine. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N⁴ is 2′-deoxythymidine.

In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N⁵ is 2′-deoxythymidine. In certain embodiments, in N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497), N⁵ is 2′-deoxythymidine comprising a 3′-phosphotriester.

In certain embodiments, the oligonucleotide of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T comprises one or more internucleoside phosphorothioates. In certain embodiments, the oligonucleotide of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497) comprises at least one chiral internucleoside phosphorothioates.

In certain embodiments, the oligonucleotide of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497) is p275, p276, or p313. In certain embodiments, the oligonucleotide of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497) is p236, p238, p243, p246, p308, p361, p362, or p425. In certain embodiments, the oligonucleotide of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T(SEQ ID NO: 497) is p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488, or p489.

Immunostimulating Polynucleotides

Immunostimulating polynucleotides of the invention can function as PAMPs and can activate innate immune response or stimulate adaptive immune response by triggering TLR9 signaling (e.g., as TLR9 agonists). The sequences that may be used in the immunostimulating polynucleotides of the invention are those known in the art for class B CpG polynucleotides, or their modifications including 5-halouridine or 5-alkynyluridine, or truncated versions thereof (e.g., those containing a total of 6 to 16 nucleosides). The truncated immunostimulating polynucleotides of the invention (e.g., those containing a total of from 6 to 16 nucleosides) may contain a truncated class B CpG polynucleotide sequence (e.g., a class B CpG polynucleotide sequence, from which one or more 3′-terminal nucleotides are eliminated or one or more of the intra-sequence nucleotides excised).

The immunostimulating polynucleotide of the invention contains at least one immunostimulating sequence (ISS). For example, an immunostimulating polynucleotide of the invention can contain 1, 2, 3 or 4 ISS. The ISS in immunostimulating polynucleotides is dependent on the targeted organism. The common feature of the ISS used in the immunostimulating polynucleotides of the invention is the cytidine-p-guanosine sequence, in which p is an internucleoside phosphodiester (e.g., phosphate or phosphorothioate) or an internucleoside phosphotriester. Preferably, cytidine and guanosine in the ISS contain 2′-deoxyribose. In some embodiments, the immunostimulating polynucleotide of the invention contains 1, 2, or 3 human ISSs. For example, the human ISS can be CG or NCG, where N is uridine, cytidine, or thymidine, or a modified version of uridine or cytidine, as disclosed herein (e.g., a 5-halouridine (e.g., 5-iodouridine or 5-bromouridine), a 5-alkynyluridine (e.g., 5-ethynyluridine or 5-propynyluridine), 5-heteroaryluridine, or 5-halocytidine); and G is guanosine or a modified version thereof, as disclosed herein (e.g., 7-deazaguanosine). Preferably, the human ISS is NCG (e.g., where N is 5-halouridine). In some embodiments, the human ISS is UCG (e.g., where U is 5-alkynyluridine (e.g., 5-ethynyluridine)). Preferably, an immunostimulating polynucleotide of the invention targeting humans contains an ISS within four contiguous nucleotides that include a 5′-terminal nucleotide (e.g., an immunostimulating polynucleotide of the invention contains a 5′-terminal ISS). Murine ISS is a hexameric nucleotide sequence: Pu-Pu-CG-Py-Py, where each Pu is independently a purine nucleotide, and each Py is independently a pyrimidine nucleotide.

In some embodiments, the 5′-flanking nucleotides relative to CpG in the immunostimulating polynucleotides of the invention does not contain 2′-alkoxyriboses. Preferably, the 5′-flanking nucleotides relative to CpG in the immunostimulating polynucleotides of the invention contains only 2′-deoxyriboses as sugars.

The structural features of the immunostimulating polynucleotides of the invention may include: (1) high content of phosphorothioates (e.g., at least 50%, at least 60%, at least 70%, or at least 80% of nucleosides may be linked by phosphorothioates), (2) absence of poly-G tails, (3) nucleosides in the immunostimulating polynucleotides may contain 2′-deoxyriboses or 2′-modified riboses (e.g., 2′-halo (e.g., 2′-fluoro) or optionally substituted 2′-alkoxy (e.g., 2′-methoxy)), and/or (4) the inclusion of 5′-terminal ISS that is NCG, in which N is uridine, cytidine, or thymidine, or a modified version of uridine or cytidine, as disclosed herein (e.g., a 5-halouridine (e.g., 5-iodouridine or 5-bromouridine), a 5-alkynyluridine (e.g., 5-ethynyluridine or 5-propynyluridine), 5-heteroaryluridine, or 5-halocytidine); and G is guanosine or a modified version thereof, as disclosed herein (e.g., 7-deazaguanosine).

In some embodiments, the conjugate contains one targeting moiety (e.g., an antibody or antigen-binding fragment thereof) and one immunomodulating polynucleotide covalently linked to the targeting moiety.

Immunosuppressive Polynucleotides

A polynucleotide of the invention can suppress adaptive immune response by reducing activation of TLR9 signaling (e.g., through TLR9 antagonism). In some embodiments, immunosuppressive polynucleotides of the invention include at least two 2′-alkoxynucleotides that are 5′-flanking relative to CpG, as described by the following formula: N¹—N²—CG, where each of N¹ and N² is independently a nucleotide containing 2′-alkoxyribose (e.g., 2′-methoxyribose).

Structural Features of the Polynucleotides

Abasic Spacers

The immunomodulating polynucleotides disclosed herein may include one or more (e.g., one or two) abasic spacers (e.g., internucleoside abasic spacers and/or terminal abasic spacers). When the immunomodulating polynucleotide includes two or more of the abasic spacers, the structures of the abasic spacers may be same or different.

An abasic spacer is of formula (I): R¹-L¹-[-L²-(L¹)_(n1)-]_(n2)-R²,   (I)

where

n1 is 0 or 1,

n2 is an integer from 1 to 6,

R¹ is a bond to a nucleoside in the immunomodulating polynucleotide,

R² is a bond to a nucleoside in the immunomodulating polynucleotide or to a capping group,

each L¹ is independently a phosphodiester or a phosphotriester, and

each L² is a sugar analogue.

In particular embodiments, if the abasic spacer is an internucleoside, abasic spacer, n1 is 1, and R² is a bond to a nucleoside, and if the abasic spacer is a terminal, abasic spacer, n1 is 0 or 1, and R² is a bond to a capping group.

In some embodiments, the abasic spacer is an internucleoside, abasic spacer or a 3′-terminal, abasic spacer. In certain embodiments, each two contiguous L² groups are separated by L¹ groups (e.g., n1 is 1 for L¹ disposed between two contiguous L² groups).

In certain embodiments, the immunostimulating polynucleotide contains an ISS disposed within four contiguous nucleotides that include a 5′-terminal nucleotide of the immunostimulating polynucleotide,

where the ISS is NCG, where N is uridine, cytidine, or thymidine, or a modified version of uridine orcytidine, as disclosed herein (e.g., a 5-halouridine (e.g., 5-iodouridine or 5-bromouridine), a 5-alkynyluridine (e.g., 5-ethynyluridine or 5-propynyluridine), 5-heteroaryluridine, or 5-halocytidine), and

where N and C are linked to each other through a phosphodiester or phosphotriester.

Sugar Analogues

A sugar analogue is a divalent or trivalent group that is a C₃₋₆ monosaccharide or C₃₋₆ alditol (e.g., glycerol), which is modified to replace two hydroxyl groups with bonds (i) to an oxygen atom in one phosphoester and (ii) to an oxygen atom in another phosphoester or to a capping group. A sugar analogue is cyclic or acyclic. Further optional modifications included in a sugar analogue are: a replacement of one, two, or three of the remaining hydroxyl groups or carbon-bonded hydrogen atoms with H; optionally substituted C₁₋₆ alkyl; -LinkA(-T)_(P), as defined herein; a conjugating group; —(CH₂)_(t1)—OR^(Z), where t1 is an integer from 1 to 6, and R^(Z) is optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, optionally substituted C₂₋₆ alkynyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₃₋₈ cycloalkyl, optionally substituted (C₁₋₉ heterocyclyl)-C₁₋₆-alkyl, optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkyl, or optionally substituted (C₃₋₈ cycloalkyl)-C₁₋₆-alkyl; introduction of one or two unsaturation(s) (e.g., one or two double bonds); and replacement of one, two, or three hydrogens or hydroxyl groups with substituents as defined for alkyl, alkenyl, cycloalkyl, cycloalkenyl, or heterocyclyl. In some embodiments, R^(Z) is optionally substituted C₁₋₆ aminoalkyl (e.g., optionally substituted C₁₋₆ amino alkyl containing —NH₂).

Non-limiting examples of sugar analogues are optionally substituted C₂₋₆ alkylene, optionally substituted C₂₋₆ alkenylene, optionally substituted C₅ cycloalkane-1,3-diyl, optionally substituted C₅ cycloalkene-1,3-diyl, optionally substituted heterocycle-1,3-diyl (e.g., optionally substituted pyrrolidine-2,5-diyl, optionally substituted tetrahydrofuran-2,5-diyl, or optionally substituted tetrahydrothiophene-2,5-diyl), or optionally substituted (C₁₋₄ alkyl)-(C₃₋₈ cycloalkylene) (e.g., optionally substituted (C₁ alkyl)-(C₃ cycloalkylene)). Non-limiting examples of sugar analogues are:

where

each of R¹ and R² is independently a bond to an oxygen atom in a phosphoester;

each of R³ and R⁴ is independently H; optionally substituted C₁₋₆ alkyl; —(CH₂)_(t1)—OR^(Z); or -LinkA-R^(T);

where t1 is an integer from 1 to 6;

R^(Z) is optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, optionally substituted C₂₋₆ alkynyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₃₋₈ cycloalkyl, optionally substituted (C₁₋₉ heterocyclyl)-C₁₋₆-alkyl, optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkyl, optionally substituted (C₃₋₈ cycloalkyl)-C₁₋₆-alkyl;

LinkA is linker; and

R^(T) is a bond to a targeting moiety; a conjugation moiety; optionally substituted C₁₋₆ alkyl, optionally substituted C₂₋₆ alkenyl, optionally substituted C₂₋₆ alkynyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₃₋₈ cycloalkyl, optionally substituted (C₁₋₉ heterocyclyl)-C₁₋₆-alkyl, optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkyl, or optionally substituted (C₃₋₈ cycloalkyl)-C₁₋₆-alkyl.

In certain embodiments, R^(Z) is optionally substituted C₁₋₆ aminoalkyl (e.g., optionally substituted C₁₋₆ amino alkyl containing —NH₂).

Phosphoesters

The immunomodulating polynucleotides of the invention may contain one or more internucleoside phosphotriesters and/or one or two terminal phosphodiesters and/or phosphotriesters. A phosphotriester may contain a phosphate, phosphorothioate, or phosphorodithioate, in which one or two valencies are substituted with nucleosides and/or abasic spacers, and the remaining valencies are bonded to a bioreversible group, a non-bioreversible group, a linker bonded to a targeting moiety, or a conjugating group. An internucleoside phosphotriester is bonded to two nucleosides and/or abasic spacers, and the remaining valency is bonded to a bioreversible group, a non-bioreversible group, a linker bonded to a targeting moiety, or a conjugating group. An internucleoside phosphodiester is bonded to two nucleosides and/or abasic spacers. A terminal phosphodiester contains a phosphate, phosphorothioate, or phosphorodithioate at the 5′- or 3′-terminus of the immunomodulating polynucleotide, where one of the two remaining valencies is bonded to a bioreversible group, a non-bioreversible group, a linker bonded to a targeting moiety, or a conjugating group.

Linkers and Conjugation Moieties

The immunomodulating polynucleotides of the invention may contain a linker bonded to a targeting moiety and optionally one or more auxiliary moieties. The linker has a molecular weight of from 43 Da to 10 kDa (e.g., from 100 Da to 8 kDa, from 100 Da to 7 kDa, or from 100 Da to 3 kDa). The linker may be represented herein as LinkA. The linker may be a multivalent group, in which the first valency is bonded to an internucleoside or terminal phosphate, an internucleoside or terminal phosphorothioate, an internucleoside or terminal phosphorodithioate, an abasic spacer, a capping group, or a nucleobase, and a second valency is bonded to a targeting moiety. The linker may further include one or more valencies, each of which is independently bonded to an auxiliary moiety. In some embodiments (e.g., when the targeting moiety is a small molecule), the immunomodulating polynucleotide contains multiple linkers to multiple targeting moieties. In other embodiments (e.g., when the targeting moiety is an antibody or an antigen-binding fragment thereof), the immunomodulating polynucleotide may contain one linker to a targeting moiety.

The immunomodulating polynucleotides disclosed herein may include a conjugating group. A conjugating group includes at least one conjugationg moiety which is a functional group that is capable of undergoing a conjugation reaction (e.g., a cycloaddition reaction (e.g., dipolar cycloaddition), amidation reaction, or nucleophilic aromatic substitution) or is rendered capable of undergoing a conjugation reaction, upon deprotection of the functional group. Upon reaction with a complementary reactive group, the conjugating group produces the linker in the immunomodulating polynucleotide of the invention.

In particular embodiments, the linker bonded to a targeting moiety is part of an internucleoside phosphotriester. In certain embodiments, the linker bonded to a targeting moiety is part of an abasic spacer.

In some embodiments, the linker (e.g., LinkA) or a conjugating group is of formula (II): —Z¹-Q^(A1)-Z²-(-Q^(A2)-Z³—)_(k)—R^(T),   (II)

where

Z¹ is a divalent group, a trivalent group, a tetravalent group, or a pentavalent group, in which one of valency is bonded to Q^(A1), the second valency is open or, if formula (II) is for the linker, is bonded to R^(T), and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety;

Z² is absent, a divalent group, a trivalent group, a tetravalent group, or a pentavalent group, in which one of valency is bonded to Q^(A1), the second valency is bonded to Q^(A2) or R^(T), and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety;

Z³ is absent, a divalent group, a trivalent group, a tetravalent group, or a pentavalent group, in which one of valency is bonded to Q^(A2), the second valency is bonded to R^(T), and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety;

R^(T) is absent or a bond to a targeting moiety;

k is 0 or 1.

If formula (II) is for the linker,

Q^(A1) and Q^(A2) is independently absent, optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, pyrid-2-yl hydrazone, optionally substituted C₆₋₁₆ triazoloheterocyclylene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

and

R^(T) is a bond to a targeting moiety;

provided that at least one of Q^(A1) and Q^(A2) is present.

If formula (II) is for a conjugating group,

either

(i) Q^(A2) is absent, and Q^(A1) is a conjugation moiety, e.g., optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group (e.g.,

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO; and

k is 0;

or

(ii) Q^(A1) is as defined for the linker, and Q^(A2) is a conjugation moiety, e.g., optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO; and k is 1; where

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

Z³ and R^(T) are absent.

In certain embodiments, Z¹ has a branching group and two divalent segments, where the branching group is bonded to each of the two divalent segments,

where

one of the divalent segments is bonded to an internucleoside or terminal phosphate, an internucleoside or terminal phosphorothioate, an internucleoside or terminal phosphorodithioate, an abasic spacer, or a nucleobase, and the remaining divalent segment is bonded to Q^(A1);

the branching group is optionally substituted C₁₋₁₂ alkane-triyl or optionally substituted C₂₋₁₂ heteroalkane-triyl, in which two valencies are substituted with the divalent segments, and the remaining valency is substituted with

where

-   -   p1 is 1, 2, or 3;     -   each s2 is independently an integer from 0 to 10;     -   each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—,         —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—,         —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and     -   each Q^(C) is independently absent, optionally substituted C₁₋₁₂         alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally         substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂         heteroalkylene, optionally substituted C₁₋₉ heterocyclylene, or         —P(Z)(OH)—, where Z is O or S;     -   each Q^(G) is independently optionally substituted C₁₋₆         alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,         optionally substituted C₂₋₆ heteroalkane-triyl, or optionally         substituted C₂₋₆ heteroalkane-tetrayl; and     -   each Q^(H) is independently R^(M1) or         -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1), where each R^(M1)         is independently a bond to an auxiliary moiety.

In certain embodiments, Z² has a branching group and two divalent segments, where the branching group is bonded to each of the two divalent segments,

where

one of the divalent segments is bonded to a targeting moiety or Q^(A2), and the remaining divalent segment is bonded to Q^(A1);

the branching group is optionally substituted C₁₋₁₂ alkane-triyl or optionally substituted C₂₋₁₂ heteroalkane-triyl, in which two valencies are substituted with the divalent segments, and the remaining valency is substituted with

-   -   where     -   p1 is 1, 2, or 3;     -   each s2 is independently an integer from 0 to 10;     -   each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—,         —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—,         —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and     -   each Q^(C) is independently absent, optionally substituted C₁₋₁₂         alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally         substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂         heteroalkylene, optionally substituted C₁₋₉ heterocyclylene, or         —P(Z)(OH)—, where Z is O or S;     -   each Q^(G) is independently optionally substituted C₁₋₆         alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,         optionally substituted C₂₋₆ heteroalkane-triyl, or optionally         substituted C₂₋₆ heteroalkane-tetrayl; and     -   each Q^(H) is independently R^(M1) or         -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1), where each R^(M1)         is independently a bond to an auxiliary moiety.

In certain embodiments, Z³ has a branching group and two divalent segments, where the branching group is bonded to each of the two divalent segments,

where

one of the divalent segments is bonded to a targeting moiety, and the remaining divalent segment is bonded to Q^(A2);

the branching group is optionally substituted C₁₋₁₂ alkane-triyl or optionally substituted C₂₋₁₂ heteroalkane-triyl, in which two valencies are substituted with the divalent segments, and the remaining valency is substituted with

-   -   where     -   p1 is 1, 2, or 3;     -   each s2 is independently an integer from 0 to 10;     -   each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—,         —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—,         —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and     -   each Q^(C) is independently absent, optionally substituted C₁₋₁₂         alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally         substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂         heteroalkylene, optionally substituted C₁₋₉ heterocyclylene, or         —P(Z)(OH)—, where Z is O or S;     -   each Q^(G) is independently optionally substituted C₁₋₆         alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,         optionally substituted C₂₋₆ heteroalkane-triyl, or optionally         substituted C₂₋₆ heteroalkane-tetrayl; and     -   each Q^(H) is independently R^(M1) or         -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1), where each R^(M1)         is independently a bond to an auxiliary moiety.

The divalent segment in Z¹, Z², or Z³ may be -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-,

where

each s1 is independently an integer from 1 to 50 (e.g., from 1 to 30);

each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and

each Q^(C) is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene;

provided that at least one of Q^(B), Q^(C), and Q^(D) is present.

In certain embodiments, at least one Q^(C) is present in the divalent segment. In particular embodiments, Q^(C) is present in each monomeric unit of the divalent segment. In some embodiments, Z¹ is bonded through a Q^(C) that is present. In further embodiments, at least one of Q^(B) and Q^(D) is present in each monomeric unit of Z¹. In yet further embodiments, at least one of Q^(B) and Q^(D) is present in each monomeric unit of Z². In particular embodiments, only one of Z¹, Z², and Z³, when present, contains a branching group.

In yet further embodiments, one, two, or three of Z¹, Z², and Z³ are independently -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-Q^(E)-(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-,   (III)

where

each s1 is independently an integer from 1 to 50 (e.g., from 1 to 30);

each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and

each Q^(C) is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, optionally substituted C₁₋₉ heterocyclylene, or —P(Z)(OH)—, where Z is O or S; and

Q^(E) is absent or a branching group of formula (IV):

-   -   where     -   p1 is 1, 2, or 3;     -   each s2 is independently an integer from 0 to 10;     -   Q^(F) is optionally substituted C₁₋₁₂ alkane-triyl or optionally         substituted C₂₋₁₂ heteroalkane-triyl; and     -   each Q^(G) is independently optionally substituted C₁₋₆         alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,         optionally substituted C₂₋₆ heteroalkane-triyl, or optionally         substituted C₂₋₆ heteroalkane-tetrayl; and     -   each Q^(H) is independently R^(M1) or         -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1), where each R^(M1)         is independently a bond to an auxiliary moiety.

In formula (IV), Q^(G) is absent, if p1 is 1; and at least one Q^(G) is present, if p1 is 2 or 3.

In particular embodiments, Z¹ is bonded to an internucleoside or terminal phosphate, an internucleoside or terminal phosphorothioate, an internucleoside or terminal phosphorodithioate, an abasic spacer, a capping group, or a nucleobase through a Q^(C) that is present.

In particular embodiments, at least one of Q^(B), Q^(C), Q^(D), and Q^(E) is present (e.g., at least one Q^(C) is present, Q^(E) is present, or Q^(E) is absent) in the divalent segment. In certain embodiments, each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—.

In some embodiments, -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)- combine to form a group: -Q^(B)-(CH₂)_(g1)—(CH₂OCH₂)_(g2)—(CH₂)_(g3)-Q^(D)-,

where

(i) g2 is an integer from 1 to 50;

(ii) g1 is 1 and Q^(B) is —NHCO—, —CONH—, or —O—; or g1 is 0 and Q^(D) is —NHCO—; and

(iii) g3 is 1 and Q^(B) is —NHCO—, —CONH—, or —O—; or g3 is 0 and Q^(D) is —CONH—.

The conjugation moiety may be protected until an auxiliary moiety is conjugated to the polynucleotide. For example, a conjugation moiety that is protected may include —COOR^(PGO) or —NHR^(PGN), where R^(PGO) is an O-protecting group (e.g., a carboxyl protecting group), and R^(PGN) is an N-protecting group.

In further embodiments, Link A is

where

each of Q^(A1) and Q^(A2) is absent, independently optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, pyrid-2-yl hydrazone, optionally substituted C₆₋₁₆ triazoloheterocyclylene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

provided that at least one of Q^(A1) and Q^(A2) is present;

R^(T) is a bond to a targeting moiety;

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

Q^(T) is —CO—, —NH—, —NH—CH₂—, or —CO—CH₂—;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

each R^(M) is independently H, auxiliary moiety, —(CH₂)_(q7)—CO—N(R^(M1))₂, or —C[—CH₂O—(CH₂)_(q7)—CO—N(R^(M1))₂]₃, where each q7 is independently an integer from 1 to 5, and each R^(M1) is independently H or an auxiliary moiety;

each of X¹, X³, and X⁵ is independently absent, —O—, —NH—, —CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

X⁷ is absent, —O—, —O—P(O)(OH)—O—, —O—P(S)(OH)—O—, —NH—, —CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

each of X², X⁴, and X⁶ is independently absent, —O—, —NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, or —NH—C(O)—O—;

x1 and each x5 are independently 0 or 1;

each x2 is independently an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30); each x3 is independently an integer from 1 to 11;

x4 is 0, 1, or 2; and

each x6 is independently an integer from 0 to 10 (e.g., from 1 to 6), provided that the sum of both x6 is 12 or less.

In yet further embodiments, LinkA is

where

Q^(A1) is optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, or pyrid-2-yl hydrazone), optionally substituted C₆₋₁₆ triazoloheterocyclylene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

each R^(M1) is independently H or an auxiliary moiety;

R^(T) is a bond to a targeting moiety;

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

Q^(T) is —CO—, —NH—, —NH—CH₂—, or —CO—CH₂—;

Q^(P) is —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene; each of q1, q3, and q7 is independently 0 or 1;

each of q2 and q8 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

q4 is an integer from 0 to 10;

each of q5 and q6 is independently an integer from 1 to 10 (e.g., from 1 to 6); and

q9 is an integer from 1 to 10.

In still further embodiments, LinkA is

where

in each structural formula, one

represents a single bond, and the other

represents a double bond;

each R^(M1) is independently H or an auxiliary moiety;

R^(T) is a bond to a targeting moiety;

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

Q^(T) is —CO—, —CO—CH₂—, —NH—, or —NH—CH₂—;

Q^(P) is —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

each of q1, q3, and q7 is independently 0 or 1;

each of q2 and q8 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

q4 is an integer from 0 to 10;

each of q5 and q6 is independently an integer from 1 to 10 (e.g., from 1 to 6); and

q9 is an integer from 1 to 10.

In some embodiments, q5 is 0. In other embodiments q5 is an integer from 2 to 6.

In particular embodiments, a conjugating group is:

where

Q^(A1) is independently optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, pyrid-2-yl hydrazone, optionally substituted C₆₋₁₆ triazoloheterocyclyene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

Q^(A2) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

each R^(M) is independently H, auxiliary moiety, —(CH₂)_(q7)—CO—N(R^(M1))₂, or —C[—CH₂O—(CH₂)_(q7)—CO—N(R^(M1))₂]₃, where each q7 is independently an integer from 1 to 5, and each R^(M1) is independently H or auxiliary moiety;

each of X³ and X⁵ is independently absent, —O—, —NH—, —CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

X⁷ is absent, —O—, —O—P(O)(OH)—O—, —O—P(S)(OH)—O—, —NH—CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

each of X², X⁴, and X⁶ is independently absent, —O—, —NH—, —O—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, or —NH—C(O)—O—;

x1 and each x5 are independently 0 or 1;

each x2 is independently an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

each x3 is independently an integer from 1 to 11;

x4 is 0, 1, or 2; and

each x6 is independently an integer from 0 to 10 (e.g., from 1 to 6), provided that the sum of both x6 is 12 or less.

In some embodiments, a conjugating group is:

where

Q^(A1) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

X⁷ is absent, —O—, —NH—, —O—P(O)(OH)—O—, —O—P(S)(OH)—O—, —CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

X⁶ is absent, —O—, —NH—, —O—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, or —NH—C(O)—O—;

x1 is independently 0 or 1;

each x2 is independently an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

each x3 is independently an integer from 1 to 11; and

x4 is 0, 1, or 2.

In certain embodiments, a conjugating group is:

where

Q^(A1) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

Q^(P) is —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

each of q1 and q3 is independently 0 or 1;

q2 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

q4 is an integer from 0 to 10; and

q5 is an integer from 1 to 10 (e.g., from 1 to 6).

In yet further embodiments, the conjugating group is:

where

R^(P) is a bond to an internucleoside bridging group, a nucleobase, a capping group, or an abasic spacer;

Q^(P) is —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—;

each Q^(S) is independently optionally substituted C₂₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, or optionally substituted (C₆₋₁₀ aryl)-C₁₋₆-alkylene;

each of q1 and q3 is independently 0 or 1;

q2 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

q4 is an integer from 0 to 10; and

q5 is an integer from 1 to 10 (e.g., from 1 to 6).

In certain exemplary embodiments, a conjugating group is:

where q2 is an integer from 1 to 50 (e.g., an integer from 1 to 24 or from 1 to 8 (e.g., 2 or 3)), q4 is an integer from 0 to 10 (e.g., 0, 1, 2, 3, 4, 5, 6, 7, or 8), q10 is an integer from 0 to 8 (e.g., 1, 2, 3, 4, 5, or 6), q11 is 0 or 1, Z is O or S, and each R^(M) is independently H, auxiliary moiety, —(CH₂)_(q7)—CO—N(R^(M1))₂, or —C[—CH₂O—(CH₂)_(q7)—CO—N(R^(M1))₂]₃, where each q7 is independently an integer from 1 to 5, and each R^(M1) is independently H or auxiliary moiety.

The following exemplary conjugating groups can be used for conjugation to a targeting moiety through a metal-catalyzed cycloaddition:

where q2 is an integer from 1 to 50 (e.g., an integer from 1 to 24 or from 1 to 8 (e.g., 2 or 3)), q4 is an integer from 0 to 10 (e.g., 0, 1, 2, 3, 4, 5, 6, 7, or 8), q10 is an integer from 0 to 8 (e.g., 1, 2, 3, 4, 5, or 6), q11 is 0 or 1, and Z is O or S.

The following exemplary conjugating groups can be used for conjugation to a targeting moiety through a metal-free cycloaddition:

where q2 is an integer from 1 to 50 (e.g., an integer from 1 to 24 or from 1 to 8 (e.g., 2 or 3)), q4 is an integer from 0 to 10 (e.g., 0, 1, 2, 3, 4, 5, 6, 7, or 8), q10 is an integer from 0 to 8 (e.g., 1, 2, 3, 4, 5, or 6), q11 is 0 or 1, Z is O or S, and each R^(M) is independently H, an auxiliary moiety, —(CH₂)_(q7)—CO—N(R^(M1))₂, or —C[—CH₂O—(CH₂)_(q7)—CO—N(R^(M1))₂]₃, where each q7 is independently an integer from 1 to 5, and each R^(M1) is independently H or auxiliary moiety.

The following exemplary conjugating groups can be used for conjugation to a targeting moiety through amide formation:

where q2 is an integer from 0 to 50 (e.g., an integer from 1 to 8 (e.g., 2 or 3)), and q12 is an integer from 1 to 11 (e.g., an integer from 1 to 5 (e.g., 1, 2, 3, 4, or 5).

Bioreversible Groups

A bioreversible group is a monovalent substituent having a molecular weight of from 135 Da to 10 kDa (e.g., from 135 Da to 5 kDa, from 200 Da to 5 kDa, or from 200 Da to 2 kDa) and containing disulfide (—S—S—). In a bioreversible group, the shortest chain of atoms covalently linking the disulfide and the valency of the bioreversible group may be from 2 to 10 atoms (e.g., from 2 to 6 atoms or from 4 to 6 atoms (e.g., 4 or 5 atoms)). The bioreversible group may be cleavable intracellularly under physiological conditions.

A bioreversible group may be included in phosphoesters, e.g., to reduce the overall negative charge of an immunomodulating polynucleotide of the invention. The reduction in the overall negative charge of an immunomodulating polynucleotide may enhance cellular uptake of an immunomodulating polynucleotide and/or conjugate of the invention. Immunomodulating polynucleotides of the invention may include one or more bioreversible groups in phosphoesters and/or abasic spacers. In some embodiments, an immunomodulating polynucleotide of the invention may include from 1 to 6 bioreversible groups (e.g., from 1 to 4 bioreversible groups (e.g., 1, 2, or 3 bioreversible groups)).

A bioreversible group can be of formula (XXII): R⁵—S—S-(LinkB)-,   (XXII)

-   -   where     -   LinkB is a divalent group containing an sp³-hybridized carbon         atom bonded to phosphate, phosphorothioate, or         phosphorodithioate, and a carbon atom bonded to —S—S—, and R⁵ is         optionally substituted C₁₋₆ alkyl, optionally substituted C₆₋₁₀         aryl, or -LinkC(-R^(M))_(r), or LinkB is a trivalent linker         containing an sp³-hybridized carbon atom bonded to phosphate,         phosphorothioate, or phosphorodithioate, and a carbon atom         bonded to —S—S—, in which the third valency of LinkB combines         with —S—S— and R⁵ to form optionally substituted C₃₋₉         heterocyclylene;     -   LinkC is a multivalent group;     -   each R^(M) is independently H, an auxiliary moiety, or         -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1),         -   where         -   each R^(M1) is independently H or an auxiliary moiety,         -   each Q^(B) and each Q^(D) is independently absent, —CO—,             —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—,             —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—,         -   each Q^(C) is independently absent, optionally substituted             C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene,             optionally substituted C₂₋₁₂ alkynylene, optionally             substituted C₂₋₁₂ heteroalkylene, or optionally substituted             C₁₋₉ heterocyclylene,         -   each Q^(G) is independently optionally substituted C₁₋₆             alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,             optionally substituted C₂₋₆ heteroalkane-triyl, or             optionally substituted C₂₋₆ heteroalkane-tetrayl,         -   each s2 is independently an integer from 0 to 10, and         -   p1 is 2 or 3;     -   and     -   r is an integer from 1 to 6 (e.g., 1, 2, or 3).

In certain embodiments, LinkB and/or R⁵ includes a bulky group attached to —S—S—. The inclusion of a bulky group attached to —S—S— may enhance the stability of the sulfur-sulfur bond, e.g., during the polynucleotide synthesis.

In further embodiments, LinkB consists of 1, 2, or 3 groups, each of the groups being independently selected from the group consisting of optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₆₋₁₀ arylene, optionally substituted C₂₋₁₂ heteroalkylene, and optionally substituted C₁₋₉ heterocyclylene.

In particular embodiments, LinkB and —S—S— combine to form a structure selected from the group consisting of:

where

each R⁶ is independently C₂₋₇ alkanoyl; C₁₋₆ alkyl; C₂₋₆ alkenyl; C₂₋₆ alkynyl; C₁₋₆ alkylsulfinyl; C₆₋₁₀ aryl; amino; (C₆₋₁₀ aryl)-C₁₋₄-alkyl; C₃₋₈ cycloalkyl; (C₃₋₈ cycloalkyl)-C₁₋₄-alkyl; C₃₋₈ cycloalkenyl; (C₃₋₈ cycloalkenyl)-C₁₋₄-alkyl; halo; C₁₋₉ heterocyclyl; C₁₋₉ heteroaryl; (C₁₋₉ heterocyclyl)oxy; (C₁₋₉ heterocyclyl)aza; hydroxy; C₁₋₆ thioalkoxy; —(CH₂)_(q)CO₂R^(A), where q is an integer from zero to four, and R^(A) is selected from the group consisting of C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)CONR^(B)R^(C), where q is an integer from zero to four and where R^(B) and R^(C) are independently selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)SO₂R^(D), where q is an integer from zero to four and where R^(D) is selected from the group consisting of C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)SO₂NR^(E)R^(F), where q is an integer from zero to four and where each of R^(E) and R^(F) is, independently, selected from the group consisting of hydrogen, alkyl, aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; thiol; aryloxy; cycloalkoxy; arylalkoxy; (C₁₋₉ heterocyclyl)-C₁₋₄-alkyl; (C₁₋₉ heteroaryl)-C₁₋₄-alkyl; C₃₋₁₂ silyl; cyano; or —S(O)R^(H) where R^(H) is selected from the group consisting of hydrogen, C₁-C₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; or two adjacent R⁶ groups, together with the atoms to which each of the R⁶ groups is attached combine to form a cyclic group selected from the group consisting of C₆ aryl, C₂₋₅ heterocyclyl, or C₂₋₅ heteroaryl, wherein the cyclic group is optionally substituted with 1, 2, or 3 substituents selected from the group consisting of C₂₋₇ alkanoyl; C₁₋₆ alkyl; C₂₋₆ alkenyl; C₂₋₆ alkynyl; C₁₋₆ alkylsulfinyl; C₆₋₁₀ aryl; amino; (C₆₋₁₀ aryl)-C₁₋₄-alkyl; C₃₋₈ cycloalkyl; (C₃₋₈ cycloalkyl)-C₁₋₄-alkyl; C₃₋₈ cycloalkenyl; (C₃₋₈ cycloalkenyl)-C₁₋₄-alkyl; halo; C₁₋₉ heterocyclyl; C₁₋₉ heteroaryl; (C₁₋₉ heterocyclyl)oxy; (C₁₋₉ heterocyclyl)aza; hydroxy; C₁₋₆ thioalkoxy; —(CH₂)_(q)CO₂R^(A), where q is an integer from zero to four, and R^(A) is selected from the group consisting of C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)CONR^(B)R^(C), where q is an integer from zero to four and where R^(B) and R^(C) are independently selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)SO₂R^(D), where q is an integer from zero to four and where R^(D) is selected from the group consisting of C₁₋₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; —(CH₂)_(q)SO₂NR^(E)R^(F), where q is an integer from zero to four and where each of R^(E) and R^(F) is, independently, selected from the group consisting of hydrogen, alkyl, aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl; thiol; aryloxy; cycloalkoxy; arylalkoxy; (C₁₋₉ heterocyclyl)-C₁₋₄-alkyl; (C₁₋₉ heteroaryl)-C₁₋₄-alkyl; C₃₋₁₂ silyl; cyano; and —S(O)R^(H) where R^(H) is selected from the group consisting of hydrogen, C₁-C₆ alkyl, C₆₋₁₀ aryl, and (C₆₋₁₀ aryl)-C₁₋₄-alkyl;

m1 is 0, 1, or 2; and

m2 is 0, 1, 2, 3, or 4;

or LinkB, —S—S—, and R⁵ combine to form a group containing

In yet further embodiments, LinkC can include from 0 to 3 multivalent monomers (e.g., optionally substituted C₁₋₆ alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl, ortrivalent nitrogen atom) and one or more divalent monomers (e.g., from 1 to 40), where each divalent monomer is independently optionally substituted C₁₋₆ alkylene; optionally substituted C₂₋₆ alkenylene; optionally substituted C₂₋₆ alkynylene; optionally substituted C₃₋₈ cycloalkylene; optionally substituted C₃₋₈ cycloalkenylene; optionally substituted C₆₋₁₄ arylene; optionally substituted C₁₋₉ heteroarylene having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted C₁₋₉ heterocyclylene having 1 to 4 heteroatoms selected from N, O, and S; imino; optionally substituted N; O; or S(O)_(m), wherein m is 0, 1, or 2. In some embodiments, each monomer is independently optionally substituted C₁₋₆ alkylene; optionally substituted C₃₋₈ cycloalkylene; optionally substituted C₃₋₈ cycloalkenylene; optionally substituted C₆₋₁₄ arylene; optionally substituted C₁₋₉ heteroarylene having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted C₁₋₉ heterocyclylene having 1 to 4 heteroatoms selected from N, O, and S; imino; optionally substituted N; O; or S(O)_(m), where m is 0, 1, or 2 (e.g., m is 2). In certain embodiments, each monomer is independently optionally substituted C₁₋₆ alkylene; optionally substituted C₃₋₈ cycloalkylene; optionally substituted C₃₋₈ cycloalkenylene; optionally substituted C₆₋₁₄ arylene; optionally substituted C₁₋₉ heteroarylene having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted C₁₋₉ heterocyclylene having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted N; O; or S(O)_(m), where m is 0, 1, or 2 (e.g., m is 2). The non-bioreversible linker connecting the auxiliary moiety to the conjugation moiety or to the reaction product thereof can include from 2 to 500 (e.g., 2 to 300, 2 to 200, 2 to 100, or 2 to 50) of such monomers. LinkC may include one or more polyethylene glycols (e.g., the polyethylene glycols may have a molecular weight of from 88 Da to 1 kDa (e.g., from 88 Da to 500 Da).

Compounds that may be used in the preparation of group -LinkC(-R^(M))_(r) in formula (IIa) are described herein as well as in WO 2015/188197. Non-limiting examples of -LinkC(-R^(M))_(r) include:

where

R¹⁴ is a bond to —S—S—,

R^(M) is an auxiliary moiety or -Q^(G)[(-Q^(B)-Q^(C)-Q^(D))_(s2)-R^(M1)]_(p1),

-   -   where     -   each R^(M1) is independently H or an auxiliary moiety,     -   each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—,         —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—,         —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—,     -   each Q^(C) is independently absent, optionally substituted C₁₋₁₂         alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally         substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂         heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene;     -   each Q^(G) is independently optionally substituted C₁₋₆         alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl,         optionally substituted C₂₋₆ heteroalkane-triyl, or optionally         substituted C₂₋₆ heteroalkane-tetrayl,     -   each s2 is independently an integer from 0 to 10, and     -   p1 is 2 or 3;

each r4 is independently an integer from 1 to 6; and

each r5 is independently an integer from 0 to 10.

In certain embodiments, R^(M) is an auxiliary moiety. In some embodiments, at least one R^(M1) is an auxiliary moiety.

In certain embodiments, the bioreversible linker group is

wherein one end of the group is connected to a polynucleotide and the other end is connected to a target moiety (in one embodiment, an antibody).

Non-Bioreversible Groups

A non-bioreversible group is a monovalent substituent that does not contain bonds cleavable under physiologic conditions in serum or in an endosome (e.g., esters, thioesters, or disulfides). The non-bioreversible group may be optionally substituted C₂₋₁₆ alkyl; optionally substituted C₃₋₁₆ alkenyl; optionally substituted C₃₋₁₆ alkynyl; optionally substituted C₃₋₈ cycloalkyl; optionally substituted C₃₋₈ cycloalkenyl; optionally substituted (C₃₋₈ cycloalkyl)-C₁₋₄-alkyl; optionally substituted (C₃₋₈ cycloalkenyl)-C₁₋₄-alkyl; optionally substituted C₆₋₁₄ aryl; optionally substituted (C₆₋₁₄ aryl)-C₁₋₄-alkyl; optionally substituted C₁₋₉ heteroaryl having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted (C₁₋₉ heteroaryl)-C₁₋₄-alkyl having 1 to 4 heteroatoms selected from N, O, and S; optionally substituted C₂₋₉ heterocyclyl having 1 to 4 heteroatoms selected from N, O, and S, where the heterocyclyl does not contain an S—S bond; optionally substituted (C₂₋₉ heterocyclyl)-C₁₋₄-alkyl having 1 to 4 heteroatoms selected from N, O, and S, where the heterocyclyl does not contain an S—S bond; or a group of formula (XXIII):

where

-   -   L³ is C₂₋₆ alkylene;     -   R⁷ is optionally substituted C₂₋₆ alkyl; optionally substituted         C₆₋₁₄ aryl; optionally substituted (C₆₋₁₄ aryl)-C₁₋₄-alkyl;         optionally substituted C₃₋₈ cycloalkyl; optionally substituted         (C₃₋₈ cycloalkyl)-C₁₋₄-alkyl; optionally substituted C₁₋₉         heteroaryl having 1 to 4 heteroatoms selected from the group         consisting of N, O, and S; optionally substituted (C₁₋₉         heteroaryl)-C₁₋₄-alkyl having 1 to 4 heteroatoms selected from         the group consisting of N, O, and S; optionally substituted C₂₋₉         heterocyclyl having 1 to 4 heteroatoms selected from the group         consisting of N, O, and S, wherein the heterocyclyl does not         contain an S—S bond; optionally substituted (C₂₋₉         heterocyclyl)-C₁₋₄-alkyl having 1 to 4 heteroatoms selected from         N, O, and S, wherein the heterocyclyl does not contain an S—S         bond; and a polyethylene glycol) terminated with —OH, C₁₋₆         alkoxy, or —COOH; and     -   R⁸ is H or C₁₋₆ alkyl.

A non-bioreversible phosphotriester may be a phosphate or a phosphorothioate substituted with a substituent that is a conjugating group, C₂₋₆ alkyl,

or a group formed by cycloaddition reaction of

with an azido-containing substrate,

where

n is an integer from 1 to 6;

R⁹ is optionally substituted C₆ aryl; optionally substituted C₄₋₅ heteroaryl that is a six member ring containing 1 or 2 nitrogen atoms; or optionally substituted C₄₋₅ heterocyclyl that is a six member ring containing 1 or 2 nitrogen atoms;

R¹⁰ is H or C₁₋₆ alkyl;

R¹¹ is a halogen, —COOR^(11A), or —CON(R^(11B))₂, where each of R^(11A) and R^(11B) is independently H, optionally substituted C₁₋₆ alkyl, optionally substituted C₆₋₁₄ aryl, optionally substituted C₁₋₉ heteroaryl, or optionally substituted C₂₋₉ heterocyclyl; and

the azido-containing substrate is

In some embodiments, a non-bioreversible group is -LinkD(-R^(M1))_(r1), where LinkD is a multivalent linker, each R^(M1) is independently H or an auxiliary moiety, and r1 is an integer from 1 to 6.

In some instances, -LinkD(-R^(M1))_(r1) is of formula (XXIV): -Q^(R)-Q³([-Q⁴-Q⁵-Q⁶]_(r2)-Q⁷-R^(M1))_(r1),   (XXIV)

where

r1 is an integer from 1 to 6;

each r2 is independently an integer from 0 to 50 (e.g., from 0 to 30), where the repeating units are same or different;

Q^(R) is [-Q⁴-Q⁵-Q⁶]_(r2)-Q^(L)-, where Q^(L) is optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, pyrid-2-yl hydrazone, optionally substituted C₆₋₁₆ triazoloheterocyclylene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

(e.g., A), or a dihydropyridazine group

Q³ is a linear group (e.g., [-Q⁴-Q⁵-Q⁶]_(r2)-), if r1 is 1, or a branched group (e.g., [-Q⁴-Q⁵-Q⁶]_(s)-Q⁸([-Q⁴-Q⁵-Q⁶]_(r2)-(Q⁸)_(r3))_(r4), where r3 is 0 or 1, r4 is 0, 1, 2, or 3), if r1 is an integer from 2 to 6; each r2 is independently an integer from 0 to 50 (e.g., from 0 to 30), where the repeating units are the same or different;

each Q⁴ and each Q⁶ is independently absent —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; each Q⁵ is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene;

each Q⁷ is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —CH₂—, —C(O)O—, —OC(O)—, —C(O)NH—, —NH—C(O)—, —NH—CH(R^(a))—C(O)—, or —C(O)—CH(R^(a))—NH—;

each Q⁸ is independently optionally substituted C₁₋₆ alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl, optionally substituted C₂₋₆ heteroalkane-triyl, or optionally substituted C₂₋₆ heteroalkane-tetrayl; and

each R^(a) is independently H or an amino acid side chain; and

each R^(M1) is independently H or an auxiliary moiety.

In formula (XXIV), at least one of Q⁴, Q⁵, and Q⁶ is present. In formula (XXIV), LinkD may include a single branching point, if each r3 is 0, or multiple branching points, if at least one r3 is 1. In formula (XXIV), Q^(R) may be -Q⁵-Q⁴-Q^(L)-, where Q⁵ is optionally substituted C₂₋₁₂ heteroalkylene or optionally substituted C₁₋₁₂ alkylene, and Q⁴ is —CO—, —NH—, or —O—. In formula (XXIV), Q^(L) may be:

In formula (XXIV), Q³ may be a linear group of formula [-Q⁴-Q⁵-Q⁶]_(r2)-, where Q⁴, Q⁵, and Q⁶ are as defined for formula (XXIV). Alternatively, Q³ may be a branched group [-Q⁴-Q⁵-Q⁶]_(r2)-Q⁸([-Q⁴-Q⁵-Q⁶]_(r2)-(Q⁸)_(r3))_(r4), where each Q⁸ is independently optionally substituted C₁₋₆ alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl, optionally substituted C₂₋₆ heteroalkane-triyl, or optionally substituted C₂₋₆ heteroalkane-tetrayl;

where

each r2 is independently an integer from 0 to 50 (e.g., from 0 to 30), where the repeating units are the same or different;

r3 is 0 or 1;

r4 is 0, 1, 2, or 3;

where,

-   -   when r3 is 0, LinkD is a trivalent or tetravalent group, and,     -   when r3 is 1, LinkD is a tetravalent, pentavalent, or hexavalent         group.

In certain embodiments, r3 is 0.

In some embodiments, Q⁸ is:

Compounds that may be used in the preparation of group -LinkD(-R^(M1))_(P) in formula (I) are described herein as well as in WO 2015/188197.

In certain embodiments, the non-bioreversible linker group is

wherein one end of the group is connected to a polynucleotide and the other end is connected to a target moiety (in one embodiment, an antibody).

Auxiliary Moieties

An auxiliary moiety is a monovalent group containing a dye or a hydrophilic group or a combination thereof (e.g., a hydrophilic polymer (e.g., polyethylene glycol) (PEG)), a positively charged polymer (e.g., polyethylene imine)), or a sugar alcohol (e.g., glucitol)). An auxiliary moiety may have a theoretical molecular weight of from 100 Da to 2.5 kDa (e.g., from 350 Da to 2.5 kDa, from 100 Da to 1,200 Da, or from 1 kDa to 2.5 kDa).

Dyes may be included in the phosphoester groups for the purpose of visualization of uptake or monitoring the movement of the conjugates of the invention inside a cell (e.g., using Fluorescence Recovery After Photobleaching (FRAP)). Dyes known in the art may be included as an auxiliary moiety linked to the polynucleotide via a phosphate or phosphorothioate at the 5′- or 3′-terminus or via a phosphate or phosphorothioate bonding two consecutive nucleosides together. Non-limiting examples of useful structures that can be used as dyes include FITC, RD1, allophycocyanin (APC), aCF™ dye (Biotium, Hayward, Calif.), BODIPY (Invitrogen™ 10 of Life Technologies, Carlsbad, Calif.), AlexaFluor® (Invitrogen™ of Life Technologies, Carlsbad, Calif.), DyLight Fluor (Thermo Scientific Pierce Protein Biology Products, Rockford, Ill.), ATTO (ATTO-TEC GmbH, Siegen, Germany), FluoProbe (Interchim SA, Motlugon, France), and Abberior Probes (Abberior GmbH, Gottingen, Germany).

Hydrophilic polymers and positively charged polymers that may be used as auxiliary moieties in the immunomodulating polynucleotides of the invention and in the conjugates of the invention are known in the art. A non-limiting example of a hydrophilic polymer is polyethylene glycol). A non-limiting example of a positively charged polymer is polyethylene imine).

A sugar alcohol-based auxiliary moiety may be, e.g., amino-terminated glucitol or a glucitol cluster. The amino-terminated glucitol auxiliary moiety is:

Non-limiting examples of glucitol clusters are:

In one embodiment, provided herein is a compound of Formula (B): R^(x)-L^(N)-(Q)_(e)  (B) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein:

R^(x) is a conjugating group;

L^(N) is a linker;

each Q is independently an oligonucleotide comprising a phosphotriester; and

e is an integer of 1, 2, 3, or 4.

In certain embodiments, in Formula (B), R^(x) is

In certain embodiments, in Formula (B), L^(N) is a linker comprising a polyethylene glycol.

In certain embodiments, in Formula (B), L^(N) is

wherein d is an integer ranging from about 0 to about 50. In certain embodiments, d is an integer ranging from about 0 to about 10. In certain embodiments, d is an integer ranging from about 0 to about 5. In certain embodiments, d is an integer of about 0, about 1, or about 3.

In certain embodiments, in Formula (B), e is an integer of 1.

In certain embodiments, in Formula (B), each Q independently has the structure of Formula (D):

wherein X^(N), X^(3′), X^(5′), Y^(P), b, and c are each as defined herein.

Targeting Moieties

The targeting moieties used in the conjugates of the invention can be used to target specific cells and tissues in a body for targeted delivery of the conjugated payload polynucleotide. The cells targeted by the conjugates of the invention are professional APCs (e.g., B cells, pDCs, or macrophages). The targeting moiety can be an antigen-binding moiety (e.g., an antibody or antigen-binding fragment thereof), a polypeptide, an aptamer, or a group including one or more small molecules (e.g., mannose). The targeting moieties in the conjugates of the invention can be effective in addressing the problem of the uneven tissue distribution of of immunomodulating polynucleotides in vivo.

Antigen-Binding Moieties

An antigen-binding moiety in the conjugate of the invention can be an antibody or an antigen-binding fragment thereof (e.g., F(ab)₂ or Fab) or an engineered derivative thereof (e.g., Fcab or a fusion protein (e.g., scFv)). A human or chimeric (e.g., humanized) antibody can be used as an antibody in the conjugate of the invention.

The antigen-binding moiety targets the cells having the surface antigen that is recognized by the antigen-binding moiety. In particular, APCs can be targeted by the antigen-binding moieties in the conjugates of the invention. B cells can be targeted by anti-CD38, anti-CD79b, anti-CD30, anti-CD22, or anti-CD20, anti-CD19 antibodies or antigen-binding fragments thereof or engineered derivatives thereof. Plasmacytoid dendritic cells (pDCs) can be targeted by anti-DEC205, anti-CD304, anti-CD303, anti-CD40, anti-CD74, anti-BDCA2, or anti-CD123 antibodies or antigen-binding fragments thereof or engineered derivatives thereof. Macrophages can be targeted by anti-CD163, anti-CD40, anti-CD74, anti-CD206, or anti-CD123 antibodies or antigen-binding fragments thereof or engineered derivatives thereof.

Non-limiting examples of anti-CD38 antibodies are daratumumab, SAR650984, MOR202, or any one of antibodies Ab79, Ab19, Ab43, Ab72, and Ab110 disclosed in WO 2012/092616, the disclosure of these antibodies is incorporated herein by reference. A non-limiting example of an anti-CD79b antibody is huMA79b v28 disclosed in WO 2014/011521. A non-limiting example of an anti-CD22 antibody is 10F4 disclosed in US 2014/0127197. A non-limiting example of an anti-CD20 antibody is rituximab. A non-limiting example of an anti-DEC205 antibody is provided in US 2010/0098704, the antibodies of which are incorporated herein by reference. Non-limiting examples of anti-CD40 antibodies are lucatumumab and dacetuzumab. A non-limiting example of of an anti-CD304 antibody is vesencumab.

Polypeptides

The targeting moiety can be a polypeptide having an affinity for cells (e.g., having an affinity for a cell type, e.g., a plasmacytoid cell). Non-limiting examples of polypeptides are RGD peptide, rabies virus glycoprotein (RVG), and a DC3 peptide.

Small Molecules

The targeting moiety can be a small molecule capable of complexing a receptor expressed on the surface of the targeted cell. Non-limiting examples of small molecules that may be used as targeting moieties in the conjugates of the invention are folate, mannose, PSMA ligand, and mannose clusters.

Folate may be used as a targeting moiety. In the conjugates of the invention, folate may be of the following structure:

Mannose or a mannose cluster can be used to target the conjugates of the invention to plasmacytoid dendritic cells and macrophages, as these cells express mannose receptor on their surface.

Mannose clusters are known in the art. The mannose auxiliary moiety (e.g., a mannose cluster) may be of formula (XXV): -(-Q^(M1)-Q^(M2)-Q^(M3)-)_(s3)-Q^(M4)[(-Q^(M1)-Q^(M2)-Q^(M3)-)_(s3)-Q^(M5)]_(p3),   (XXV)

where

p3 is 1, 2, or 3;

each s3 is independently an integer from 0 to 50 (e.g., from 0 to 30);

each Q^(M1) and each Q^(M3) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and

each Q^(M2) is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene;

Q^(M4) is absent (if p3 is 1), optionally substituted C₁₋₆ alkane-triyl (if p3 is 2), optionally substituted C₁₋₆ alkane-tetrayl (if p3 is 3), optionally substituted C₂₋₆ heteroalkane-triyl (if p3 is 2), or optionally substituted C₂₋₆ heteroalkane-tetrayl (if p3 is 3);

each Q^(M5) is independently mannose or -Q^(M6)[(-Q^(M1)-Q^(M2)-Q^(M3))_(s2)-R^(M2)]_(p1), where each R^(M2) is independently mannose; and

each Q^(M6), if present, is independently optionally substituted C₁₋₆ alkane-triyl, optionally substituted C₁₋₆ alkane-tetrayl, optionally substituted C₂₋₆ heteroalkane-triyl, or optionally substituted C₂₋₆ heteroalkane-tetrayl.

Non-limiting examples of mannose clusters are:

where each a is independently an integer from Oto 10. Conjugates

In one embodiment, provided herein is a conjugate of Formula (C): Ab

L^(N)-(Q)_(e)]_(f)  (C) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein Ab is a targeting moiety; f is an integer of 1, 2, 3, or 4; and L^(N), Q, and e are each as defined herein.

In certain embodiments, in Formula (C), Ab is an antibody. In certain embodiments, in Formula (C), Ab is a monoclonal antibody.

In certain embodiments, in Formula (C), f is an integer of 1 or 2. In certain embodiments, in Formula (C), f is an integer of 1.

In certain embodiments, in Formula (C), both e and f are each an integer of 1. The term “DAR” refers to a drug-antibody ratio of a CpG antibody conjugate, more specifically a polynucleotide-antibody ratio. In one embodiment, the CpG antibody conjugate has a DAR ranging from about 1 to about of about 20, from about 1 to about 10, from about 1 to about 8, from about 1 to about 4, or from about 1 to about 2. In another embodiment, the CpG antibody conjugate has a DAR of about 1, about 2, about 3, about 4, about 5, about 6, about 7, or about 8.

Preparation of Conjugates

Conjugation

Reactions useful for conjugating a targeting moiety to one or more immunomodulating polynucleotides are described herein and are known in the art (e.g., bioorthogonal reactions). Exemplary reactions that can be used to form this bond include Hüisgen cycloaddition (metal-catalyzed or metal-free) between an azido and an alkyne-based conjugating group (e.g., optionally substituted C₆₋₁₆ heterocyclylene containing an endocyclic carbon-carbon triple bond or optionally substituted C₈₋₁₆ cycloalkynyl) to form a triazole moiety; the Diels-Alder reaction between a dienophile and a diene/hetero-diene; bond formation via other pericyclic reactions such as the ene reaction; amide orthioamide bond formation; sulfonamide bond formation (e.g., with azido compounds); alcohol or phenol alkylation (e.g., Williamson alkylation), condensation reactions to form oxime, hydrazone, or semicarbazide group; conjugate addition reactions by nucleophiles (e.g., amines and thiols); disulfide bond formation; and nucleophilic substitution (e.g., by an amine, thiol, or hydroxyl nucleophile) at a carbonyl (e.g., at an activated carboxylic acid ester, such as pentafluorophenyl (PFP) ester or tetrafluorophenyl (TFP) ester) or at an electrophilic arene (e.g., SnAr at an oligofluorinated arene, a fluorobenzonitrile group, or fluoronitrobenzene group). In some embodiments, the conjugation reaction is a dipolar cycloaddition, and the conjugation moiety includes azido, optionally substituted C₆₋₁₆ heterocyclylene containing an endocyclic carbon-carbon triple bond, or optionally substituted C₈₋₁₆ cycloalkynyl. The complementary reactive group and the conjugating group are selected for their mutual complementarity. For example, an azide may be used in one of the conjugating group and the complementary reactive group, while an alkyne may be used in the other of the conjugating group and the complementary reactive group.

Nucleophile/Electrophile Reactions

Nucleophiles and electrophiles can engage in bond forming reactions selected from, without limitation, insertion by an electrophile into a C—H bond, insertion by an electrophile into an O—H bond, insertion by an electrophile into an N—H bond, addition of the electrophile across an alkene, addition of the electrophile across an alkyne, addition to electrophilic carbonyl centers, substitution at electrophilic carbonyl centers, addition to ketenes, nucleophilic addition to isocyanates, nucleophilic addition to isothiocyanates, nucleophilic substitution in electrophilic silyl groups, nucleophilic displacement of a leaving group (e.g., a halide or a pseudohalide) in an alkyl halide or pseudohalide; nucleophilic addition/elimination at a carbonyl of an activated carboxylic acid ester (e.g., PFP ester or TFP ester), thioester, anhydride, or acyl halide; 1,4-conjugate addition of a nucleophile to an α, β-unsaturated carbonyl groups, nucleophilic ring opening of an epoxide, nucleophilic aromatic substitution of an electron deficient aromatic compound, a nucleophilic addition to activated phosphorus centers, nucleophilic substitution at activated phosphorous centers, nucleophilic addition to activated sulfur centers, and nucleophilic substitution at activated sulfur centers.

A nucleophilic conjugating group can be optionally substituted alkene, optionally substituted alkyne, optionally substituted aryl, optionally substituted heterocyclyl, hydroxyl, amino, alkylamino, anilido, orthio.

An electrophilic conjugating group can be azide, activated carbonyl (e.g., activated carboxylic acid ester (e.g., succinimidyl ester or sulfosuccinimidyl ester), thioester, anhydride, or acyl halide), isocyanate, thioisocyanate, Michael acceptor (e.g., maleimide), alkyl halide or pseudohalide, epoxide, episulfide, aziridine, or electron-deficient aryl.

For example, conjugation can occur via a condensation reaction to form a linkage that is a hydrazone bond.

Conjugation can involve the formation of an amide bond, e.g., by activation of a carboxyl-based conjugating group (e.g., carboxylic acid, ester, or —CONH₂) and subsequent reaction with a primary amine in a conjugating group. Activating agents can be various carbodiimides like: EDC (1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride), EDAC (1-ethyl-3(3-dimethylaminopropyl)carbodiimide hydrochloride), DCC (dicyclohexyl carbodiimide), CMC (1-Cyclohexyl-3-(2-morpholinoethyl) carbodiimide), DIC (diisopropyl carbodiimide) or Woodward's reagent K (N-ethyl-3-phenylisoxazolium-3′-sulfonate). Activation of the carboxyl-based conjugating group that is —CONH₂ can be achieved using a transglutaminase. Reaction of an activated NHS-Ester-based conjugating group with a primary amine-based conjugating group also results in formation of an amide bond.

The polynucleotide may contain a carbonyl-based conjugating group. Conjugation with concomitant formation of a secondary amine can be achieved through reductive amination (i.e., by reacting an amine-based conjugating group with an aldehyde-based conjugating group, followed by a reduction with a hydride donor (e.g., sodium cyanoborohydride or sodium triacetoxyborohydride)).

Ether formation can also be used to conjugate a targeting moiety to one or more polynucleotides to form a conjugate of the invention. Ether linkage formation can involve a reaction between an epoxide-based conjugating group with a hydroxy-based conjugating group.

Thiols can also be used as conjugating groups. For example, conjugation via the formation of disulfide bonds can be accomplished by pyridyldisulfide mediated thiol-disulfide exchange. Introduction of sulfhydryl-based conjugating groups is mediated for instance by Traut's Reagent (2-iminothiolane) SATA (N-succinimidyl S-acetylthioacetate, SATP (succinimidyl acetylthiopropionate), SPDP (N-succinimidyl 3-(2-pyridyldithio)propionate, SMPT (succinimidyloxycarbonyl-α-methyl-α-(2-pyridyldithio)toluene), N-acetylhomocysteinethiolactone, SAMSA (S-acetylmercaptosuccinic anhydride), AMBH (2-Acedamido-4-mercaptobuturic acid hydrazide), and cystamine (2,2′-dithiobis(ethylamine).

Thioether linkage formation can be performed by reacting a sulfhydryl based conjugating groups with maleimide- or iodoacetyl-based conjugating groups or by reacting with epoxide-based conjugating groups.

Maleimide-based conjugating groups can be introduced by SMCC (succinimidyl-4-(N-maleimidomethyl)cyclohexane-1-carboxylate), sulfo-SMCC (sulfosuccinimidyl 4-(N-maleidomethyl)-cyclohexane-1-carboxylate), MBS (m-Maleimidobenzoyl-N-hydroxysuccinimide ester), sulfo-MBS (m-Maleimidobenzoyl-N-sulfohydroxy succinimide ester), SMPB (Succinimidyl-4-(p-maleidophenyl)butyrate), sulfo-SMPB (sulfosuccinimidyl 4-(p-maleimidophenyl)butyrate), GMBS (N-α-maleimidobuturyl-oxysuccinimide ester), sulfo GMBS (N-α-maleimidobuturyl-oxysulfosuccinimide ester).

Conjugation via the formation of a carbamate linkage can be performed by reaction of a hydroxy-based conjugating groups with CDI (N,N′-carbonyldiimidazole) or DSC (N,N′-disuccinimidyl carbonate) or N-hydroxysuccinimidylchloroformate and subsequent reaction with an amine-based conjugating group.

Cycloaddition Reactions

Cycloaddition reactions can be used to form the desired covalent bond. Representative cycloaddition reactions include, but are not limited to, the reaction of an alkene-based conjugating group with a 1,3-diene-based conjugating group (Diels-Alder reaction), the reaction of an alkene-based conjugating group with an α,β-unsaturated carbonyl-based conjugating group (hetero Diels-Alder reaction), and the reaction of an alkyne-based conjugating group with an azido-based conjugating group (Hüisgen cycloaddition, including metal-catalyzed and metal-free variants thereof) to afford a triazole moiety. Selected, non-limiting examples of conjugating groups that include reactants for cycloaddition reactions are: alkenes, alkynes, 1,3-dienes, α,β-unsaturated carbonyls, and azides. For example, the Hüisgen cycloaddition (click reaction) between azides and alkynes has been used for the functionalization of diverse biological entities.

Strained alkyne-based conjugating group is a carbocyclic or heterocyclic ring system including one endocyclic carbon-carbon triple bond (e.g., optionally substituted C₆₋₁₆ heterocyclylene containing an endocyclic carbon-carbon triple bond or optionally substituted C₈₋₁₆ cycloalkynyl). Strained alkyne-based conjugating groups can be useful for conjugating a targeting moiety to a polynucleotide through metal-free dipolar cycloadditions with an azido conjugating group.

Coupling Reactions

Conjugating groups can include, but are not limited to, reactants for hydrosilylation, olefin cross-metathesis, conjugate addition, Stille coupling, Suzuki coupling, Sonogashira coupling, Hiyama coupling, and Heck reaction. Conjugation moieties for these reactions include hydridosilanes, alkenes (e.g., activated alkenes, such as enones orenoates), alkynes, aryl halides, aryl pseudohalides (e.g., triflates or nonaflates), alkyl halides, and alkyl pseudohalides (e.g., triflates, nonaflates, and phosphates). Catalysts for cross-coupling reactions are well-known in the art. Such catalysts may be organometallic complexes or metal salts (e.g., Pd(0), Pd(II), Pt(0), Pt(II), Pt(IV), Cu(I), or Ru(II)). Additives, such as ligands (e.g., PPtb, PCy3, BINAP, dppe, dppf, SIMes, or SIPr) and metal salts (e.g., LiCl), may be added to facilitate cross-coupling reactions.

Preparation of Immunomodulating Polynucleotides

The immunomodulating polynucleotides can be prepared according to methods known in the art of chemical synthesis of polynucleotides, e.g., from nucleoside phosphoramidites. Non-limiting examples of the syntheses of nucleoside phosphoramidites and immunomodulating polynucleotides are provided in the Examples. The phosphoramidite can include a conjugating group covalently linked to the P atom of the phosphoramidite.

Preparation of a Targeting Moiety Portion

A targeting moiety can be conjugated to one or more polynucleotides by forming a bond between a conjugating group in the immunomodulating polynucleotide and a complementary reactive group bonded to the targeting moiety. The targeting moiety may intrinsically possess the complementary reactive group (e.g., a Q-tag (e.g., LLQGG, GGGLLQGG, or another Q-tag sequence known in the art) in an antibody or antigen-binding fragment or an engineered derivative thereof), or it may be modified to include a complementary reactive group (e.g., by attaching the complementary reactive group to the Q-tag). Methods of introducing such complementary reactive groups into a targeting moiety is known in the art.

The complementary reactive group may include optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

where

-   -   R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆         alkyl;     -   each R¹² is independently H, optionally substituted C₁₋₆ alkyl,         or O-protecting group (e.g., a carboxyl protecting group); and     -   R¹³ is halogen (e.g., F).

The complementary reactive group may be protected until the conjugation reaction. For example, a complementary reactive group that is protected may include —COOR^(PGO) or —NHR^(PGN), where R^(PGO) is an o-protecting group (e.g., a carboxyl protecting group), and R^(PGN) is an N-protecting group.

In some embodiments, a complementary reactive group is a group —Z³-Q^(A3),

where

Z³ is a divalent, trivalent, tetravalent, or pentavalent group, in which one of the valencies is substituted with Q^(A3), one of the valencies is open, and each of the remaining valencies, if present, is independently substituted with an auxiliary moiety;

Q^(A3) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

where

-   -   R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆         alkyl;     -   each R¹² is independently H, optionally substituted C₁₋₆ alkyl,         or O-protecting group (e.g., a carboxyl protecting group); and     -   R¹³ is halogen (e.g., F).

In certain embodiments, Z³ consists of a branching group and two divalent segments, where the branching group is bonded to each of the two divalent segments,

where

one of the divalent segments has an open valency, and the remaining divalent segment is bonded to Q^(A3); and

the branching group consists of one or two monomers independently selected from the group consisting of optionally substituted C₁₋₁₂ alkane-triyl, optionally substituted C₁₋₁₂ alkane-tetrayl, optionally substituted C₂₋₁₂ heteroalkane-triyl, and optionally substituted C₂₋₁₂ heteroalkane-tetrayl, where two valencies of the branching group are bonded to the two divalent segments, and each of the remaining valencies is independently substituted with an auxiliary moiety.

The divalent segment in Z³ may be -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-,

where

each s1 is independently an integer from 1 to 50 (e.g., from 1 to 30);

each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and

each Q^(C) is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene.

In further embodiments, at least one of Q^(B) and Q^(D) is present in each monomeric unit of Z³.

In yet further embodiments, —Z³-Q^(A3) is -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-Q^(E)-(-Q^(B)-Q^(C)-Q^(D)-)_(s1)-Q^(A3),   (Vb)

where

each s1 is independently an integer from 1 to 50 (e.g., from 1 to 30);

Q^(A3) is as described herein;

each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —OC(O)—, —COO—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—; and

each Q^(C) is independently absent, optionally substituted C₁₋₁₂ alkylene, optionally substituted C₂₋₁₂ alkenylene, optionally substituted C₂₋₁₂ alkynylene, optionally substituted C₂₋₁₂ heteroalkylene, or optionally substituted C₁₋₉ heterocyclylene; and

Q^(E) is absent or a branching group of formula (IV), as described herein.

In certain embodiments, each Q^(B) and each Q^(D) is independently absent, —CO—, —NH—, —O—, —S—, —SO₂—, —NHC(O)—, —C(O)NH—, —CH₂—, —CH₂NH—, —NHCH₂—, —CH₂O—, or —OCH₂—.

In some embodiments, -(-Q^(B)-Q^(C)-Q^(D)-)_(s1)- combine to form a group: -Q^(B)-(CH₂)_(g1)—(CH₂OCH₂)_(g2)—(CH₂)_(g3)-Q^(D)-,

where

(i) g2 is an integer from 1 to 50 (e.g., from 1 to 40 or from 1 to 30);

(ii) g1 is 1 and Q^(B) is —NHCO—, —CONH—, or —O—; or g1 is 0 and Q^(D) is —NHCO—; and

(iii) g3 is 1 and Q^(B) is —NHCO—, —CONH—, or —O—; or g3 is 0 and Q^(D) is —CONH—.

In further embodiments, the complementary reactive group is:

where

Q^(A2) is absent, independently optionally substituted C₂₋₁₂ heteroalkylene (e.g., a heteroalkylene containing —C(O)—N(H)—, —N(H)—C(O)—, —S(O)₂—N(H)—, or —N(H)—S(O)₂—), optionally substituted C₁₋₁₂ thioheterocyclylene

optionally substituted C₁₋₁₂ heterocyclylene (e.g., 1,2,3-triazole-1,4-diyl or

cyclobut-3-ene-1,2-dione-3,4-diyl, pyrid-2-yl hydrazone, optionally substituted C₆₋₁₆ triazoloheterocyclyene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

Q^(A3) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

R^(T) is a bond to a targeting moiety;

Q^(T) is —CO—, —NH—, —NH—CH₂—, or —CO—CH₂—;

each of X¹, X³, and X⁵ is independently absent, —O—, —NH—, —CH₂—NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, —NH—C(O)—O—, —CH₂—NH—C(O)—NH—, —CH₂—O—C(O)—NH—, or —CH₂—NH—C(O)—O—;

each of X² and X⁴ is independently absent, —O—, —NH—, —C(O)—, —C(O)—NH—, —NH—C(O)—, —NH—C(O)—NH—, —O—C(O)—NH—, or —NH—C(O)—O—;

x2 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30);

x3 is an integer from 1 to 11; and

each x5 is independently 0 or 1; and

each x6 is independently an integer from 0 to 10 (e.g., from 1 to 6), provided that the sum of both x6 is 12 or less.

In yet further embodiments, the complementary reactive group is:

where

Q^(A3) is optionally substituted C₂₋₁₂ alkynyl, optionally substituted N-protected amino, azido, N-maleimido, S-protected thiol,

or N-protected version thereof,

optionally substituted C₆₋₁₆ heterocyclyl containing an endocyclic carbon-carbon triple bond

1,2,4,5-tetrazine group

or optionally substituted C₈₋₁₆ cycloalkynyl

—NHR^(N1), optionally substituted C₄₋₈ strained cycloalkenyl (e.g., trans-cyclooctenyl or norbornenyl), or optionally substituted C₁₋₁₆ alkyl containing —COOR¹² or —CHO;

each R^(M1) is independently H or an auxiliary moiety;

R^(N1) is H, N-protecting group, or optionally substituted C₁₋₆ alkyl;

each R¹² is independently H or optionally substituted C₁₋₆ alkyl;

R¹³ is halogen (e.g., F);

Q^(T) is —CO—, —NH—, —NH—CH₂—, or —CO—CH₂—;

R^(T) is a bond to a targeting moiety;

each of q5 and q6 is independently an integer from 1 to 10 (e.g., from 1 to 6);

q7 is 0 or 1;

q8 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30); and

q9 is an integer from 1 to 10.

In yet further embodiments, the complementary reactive group is:

where

each R^(M1) is independently H or an auxiliary moiety;

Q^(T) is —CO—, —NH—, —NH—CH₂—, or —CO—CH₂—;

R^(T) is a bond to a targeting moiety;

each of q5 and q6 is independently an integer from 1 to 10 (e.g., from 1 to 6);

q7 is 0 or 1;

q8 is an integer from 0 to 50 (e.g., from 1 to 40 or from 1 to 30); and

q9 is an integer from 1 to 10.

Solid Support

The immunomodulating polynucleotides disclosed herein may be bonded to solid support. Cleavable solid supports that may be used with the polynucleotides are known in the art. Non-limiting examples of the solid support include, e.g., controlled pore glass or macroporous polystyrene bonded to a strand through a cleavable linker (e.g., succinate-based linker) known in the art (e.g., UNYLINKER™).

Methods

Conjugates of the invention can be used for selective delivery of an immunomodulating polynucleotide to a professional APC (e.g., a B cell, a pDC, or a macrophage) by using a targeting moiety that recognizes a surface receptor for the APC type. Without being bound by theory, it is thought that the conjugate of the invention can be transported (e.g., through active transport) into an endosome of a professional APC (e.g., a B cell, a pDC, or a macrophage), which expresses one or more endosomal toll-like receptors (e.g., TLR9). Thus, an immunostimulating polynucleotide delivered to the endosome can agonize the endosomal toll-like receptor (e.g., TLR9). Similarly, an immunosuppressive polynucleotide delivered to the endosome can antagonize the endosomal toll-like receptor (e.g., TLR9).

Cytokine Induction

Endosomal toll-like receptors can be agonized using an immunostimulating polynucleotide of the invention (e.g., provided in a conjugate of the invention) to induce cytokines in APCs. For example, agonizing TLR9 in a B cell can lead to the activation of NFκB-mediated secretion of inflammatory cytokines (e.g., IL-6 and IL-10), whereas agonizing TLR9 in a pDC or a macrophage can induce type I interferons (e.g., IFNα or IFNβ). Induction of a cytokine in an APC can be determined using methods known in the art. For example, a level of an induced cytokine in the APC can be higher (e.g., at least 1%, at least 10%, at least 20%, at least 30%, at least 40%, or at least 50% higher) after contacting the cell with an immunostimulating polynucleotide or conjugate of the invention (e.g., when compared to a reference cell, such as a reference cell that differs from the tested cell in that the the immunostimulating polynucleotide or conjugate of the invention was not delivered to the reference cell).

Treatment of Liquid (Hematologic) and Solid Tumors

An immunostimulating polynucleotide and/or conjugate of the invention may be used in a method of treating a liquid (e.g., hematologic) or solid tumor. Without wishing to be bound by theory, it is thought that agonizing TLR9 and inducing cytokines, as described herein, may stimulate an innate or adaptive immune response against a liquid or solid tumor. Typically, agonizing TLR9 has a pro-proliferative effect on healthy B cells. In contrast, TLR9 agonist immunostimulating polynucleotides exhibit anti-proliferative effect on B lymphoma cells. The anti-proliferative effect of TLR9 agonist immunostimulating polynucleotides does not require delivery to the B lymphoma cell. Instead, anti-proliferative effect on B lymphoma cells can be induced by delivering an immunostimulating polynucleotide to another APC (e.g., a healthy APC). Without wishing to be bound by theory, it is thought that immunostimulating polynucleotides of the invention can induce one or more cytokines in an APC (e.g., a healthy APC), and one or more induced cytokines can be transported to the B lymphoma cells to induce an anti-proliferative effect. Thus, the conjugates of the invention targeting B cells and immunostimulating polynucleotides of the invention may be useful in the treatment of liquid tumors, e.g., non-Hodgkin B-cell lymphomas. Non-limiting examples of lymphomas that may be treated using immunostimulating polynucleotides of the invention and their conjugates are mantle cell lymphoma, diffuse large B cell lymphoma, follicular lymphoma, chronic lymphocytic leukemia, and multiple myeloma. Agonizing TLR9 in pDCs and macrophages can induce type I interferon (e.g., IFNα or IFNβ) and activate NK cells, which can kill tumor cells (e.g., solid tumor cells). Thus, innate immune response stimulated by an immunostimulating polynucleotide or conjugate of the invention can result in degradation of tumor cells. The tumor cell degradation products, i.e., tumor-associated antigens, can then be recruited by pDCs to prime CD8⁺ T cells against the remaining tumor cells, thereby stimulating an adaptive immune response against the solid tumor.

Conjugates of the invention may address the problem of the uneven tissue distribution of immunostimulating polynucleotides in vivo. Accordingly, a conjugate of the invention may be administered to a patient systemically or at a site that is remote from the targeted site of action.

Toll-like receptor (TLR) signaling works as a bridge between innate and adaptive immunity. Toll-like receptor agonists are able to induce immune responses against diseased cells, (such as cancer cells or pathogen infected cells), and thus can serve as a therapeutic agent for preventing or treating such diseases. Accordingly, in certain aspects, provided herein are methods of preventing or treating a disease using a toll-like receptor (TLR) agonist. Such methods comprises administering to a subject in need thereof an therapeutic agent capable of activating a TLR, wherein upon administering of the TLR agonist, an immune response against the disease being treated is induced in the subject. In certain embodiments, the disease is selected from a neoplastic disease, such as cancer, and an infectious disease, such as a viral infection.

In some embodiments, provided herein are methods of treating cancer in a subject having cancer, comprising administering to the subject a therapeutically effective amount of a TLR agonist. As described herein, in various embodiments, the types of cancer that can be successfully treated with the present method include primary cancer, secondary cancer, recurrent cancer and refractory cancer. Further as described herein, in various embodiments, the types of cancer that can be successfully treated with the present method include solid tumor and liquid tumor. Successful treatment of a cancer can be determined by the responsible practitioner based on clinical standards, such as shown by cancer survival, cancer regress (e.g., shrinkage of tumor size), partial or complete cancer remission, including a cancer-free phenotype (i.e. no detectable cancer cell in a patient) resulted from the treatment.

Accordingly, in some embodiments, the method for preventing or treating cancer comprises administering to a subject in need thereof an therapeutically effective amount of one or more TLR agonist(s) selected from TLR1 agonists, TLR2 agonists, TLR3 agonists, TLR4 agonists, TLR5 agonists, TLR6 agonists, TLR7 agonists, TLR8 agonists, TLR9 agonists, and TLR10 agonists. Non-limiting examples of TLR agonists finding use in the present disclosure include but are not limited to Pam3Cys, a TLR1/2 agonist; CFA, a TLR2 agonist; MALP2, a TLR2 agonist; Pam2Cys, a TLR2 agonist; FSL-I, a TLR-2 agonist; Hib-OMPC, a TLR-2 agonist; polyribosinic:polyribocytidic acid (Poly I:C), a TLR3 agonist; polyadenosine-polyuridylic acid (polyAU), a TLR3 agonist; Polyinosinic-Polycytidylic acid stabilized with poly-L-lysine and carboxymethylcellulose (Hiltonol), a TLR3 agonist; bacterial LPS a TLR4 agonist, bacterial flagellin a TLR5 agonist; imiquimod, a TLR7 agonist; resiquimod, a TLR7/8 agonist; loxoribine, a TLR7/8 agonist; and unmethylated CpG ODN, a TLR9 agonist. Additional TLR agonists known in the art and finding use in the present disclosure further include, but are not limited to aminoalkyl glucosaminide phosphates (AGPs) which bind to the TLR4 receptor are known to be useful as vaccine adjuvants and immunostimulatory agents for stimulating cytokine production, activating macrophages, promoting innate immune response, and augmenting antibody production in immunized animals.

Additional TLR agonists known in the art and finding use in the present disclosure further include other pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs). (P. D'Arpa and K. Leung, Supra.) Examples of PAMPs include lipoproteins, lipopolypeptides, peptidoglycans, zymosan, lipopolysaccharide, neisserial porins, flagellin, profillin, galactoceramide, muramyl dipeptide. Peptidoglycans, lipoproteins, and lipoteichoic acids are cell wall components of Gram-positive. Lipopolysaccharides are expressed by most bacteria, with MPL being one example. Flagellin refers to the structural component of bacterial flagella that is secreted by pathogenic and commensal bacterial. rt.-Galactosylceramide (rt.-GalCer) is an activator of natural killer T (NKT) cells. Muramyl dipeptide is a bioactive peptidoglycan motif common to all bacteria. Examples of DAMPs include proteins secreted through a nonclassical secretion mechanism involving secretory lysosomes, e.g., high mobility group box (HMGB)1 and galectin-3; and molecules released by necrotic cells, e.g., S100 proteins, HMGB1, IL-1a, galectin-3, HSP60, HSP70, HSP72, histones, and nucleic acids; and extracellular matrix molecules, e.g., hyaluronan, heparin sulfate, fibronectin, and degraded matrix constituents.

Oligodeoxynucleotides (ODNs) containing CpG are agonists for TLR9 and activate both innate and adaptive immunity against tumor. As described herein, immunostimulating polynucleotides, including both naturally existing CpG ODNs and synthetic CpG-containing polynucleotides, are contemplated as therapeutic agents for preventing or treating cancer.

Accordingly, in some embodiments, provided herein are methods for treating cancer in a subject having cancer, comprising administering a therapeutically effective amount of a CpG-containing immunostimulating polynucleotide to the subject. In some embodiments, the CpG-containing immunostimulating polynucleotide administered in above methods for treating cancer is capable of activating a TLR-medicated signaling pathway upon administration. In some embodiments, the CpG-containing immunostimulating polynucleotide is naturally exiting. Examples of naturally existing CpG-containing immunostimulating polynucleotides include, without limitation, CpG ODNs of bacterial or viral origins. In some embodiments, the CpG-containing immunostimulating polynucleotide is artificially synthesized. In some embodiments, the synthetic CpG-containing immunostimulating polynucleotide has the same sequence as its natural counterpart. In some embodiments, the sequence of a synthetic CpG-containing immunostimulating polynucleotide is different from a naturally existing CpG-containing immunostimulating polynucleotide. In some embodiments, a CpG-containing immunostimulating polynucleotide is chemically modified to contain one or more chemical entities that are not normally found in nucleic acids.

In some embodiments, the CpG-containing immunostimulating polynucleotide is one of the immunostimulating polypeptides listed in Table 2 of the present disclosure. In some embodiments, the CpG-containing polynucleotide is selected from p236, p238, p243, p246, p275, p276, p308, p313, p347, p361, p362, p425, p433, p434, p435, p436, p437, p438, p477, p478, p479, p480, p481, p482, p483, p484, p485, p486, p487, p488 and p489. In some embodiments, the CpG-containing immunostimulating polynucleotide is p236. In some embodiments, the CpG-containing immunostimulating polynucleotide is p238. In some embodiments, the CpG-containing immunostimulating polynucleotide is p238. In some embodiments, the CpG-containing immunostimulating polynucleotide is p243. In some embodiments, the CpG-containing immunostimulating polynucleotide is p246. In some embodiments, the CpG-containing immunostimulating polynucleotide is p275. In some embodiments, the CpG-containing immunostimulating polynucleotide is p276. In some embodiments, the CpG-containing immunostimulating polynucleotide is p308. In some embodiments, the CpG-containing immunostimulating polynucleotide is 313. In some embodiments, the CpG-containing immunostimulating polynucleotide is p347. In some embodiments, the CpG-containing immunostimulating polynucleotide is p361. In some embodiments, the CpG-containing immunostimulating polynucleotide is p362. In some embodiments, the CpG-containing immunostimulating polynucleotide is p425. In some embodiments, the CpG-containing immunostimulating polynucleotide is p433. In some embodiments, the CpG-containing immunostimulating polynucleotide is p434. In some embodiments, the CpG-containing immunostimulating polynucleotide is p435. In some embodiments, the CpG-containing immunostimulating polynucleotide is p436. In some embodiments, the CpG-containing immunostimulating polynucleotide is p437. In some embodiments, the CpG-containing immunostimulating polynucleotide is p438. In some embodiments, the CpG-containing immunostimulating polynucleotide is p477. In some embodiments, the CpG-containing immunostimulating polynucleotide is p478. In some embodiments, the CpG-containing immunostimulating polynucleotide is p479. In some embodiments, the CpG-containing immunostimulating polynucleotide is p480. In some embodiments, the CpG-containing immunostimulating polynucleotide is p481. In some embodiments, the CpG-containing immunostimulating polynucleotide is p482. In some embodiments, the CpG-containing immunostimulating polynucleotide is p483. In some embodiments, the CpG-containing immunostimulating polynucleotide is p484. In some embodiments, the CpG-containing immunostimulating polynucleotide is p485. In some embodiments, the CpG-containing immunostimulating polynucleotide is p486. In some embodiments, the CpG-containing immunostimulating polynucleotide is p487. In some embodiments, the CpG-containing immunostimulating polynucleotide is p488. In some embodiments, the CpG-containing immunostimulating polynucleotide is p489.

As provided herein, the CpG-containing immunostimulating polynucleotide can be free-standing or form a part of a larger molecule or complex. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated, covalently or non-covalently, to an antigen or an antigenic fragment thereof. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated to an antigen encoded and expressed by a normal immune cell or an antigenic fragment thereof. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated to a T cell antigen or an epitope thereof. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated to ovalbumin (OVA) or an epitope thereof. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated to the Japanese cedar pollen allergen Cryj2 T-cell epitope peptide. In some embodiments, the CpG-containing immunostimulating polynucleotide is not conjugated to a tumor associated antigen.

In particular embodiments, the CpG-containing immunostimulating polynucleotide is conjugated to a targeting moiety for targeted delivery to a specific organ, tissue, cell and/or cellular compartment upon administering to the subject. In some embodiments, the targeting moiety is an antibody or an antigen-binding fragment thereof. In some embodiments, the targeting moiety comprises a chemical moiety as described herein.

In some embodiments, the targeting moiety specifically promotes the arrival of the CpG-containing immunostimulating polynucleotide at a targeted cell or cell population more than other non-targeted cells. The targeted delivery can be detected using methods known in the art, such as measuring the cellular concentration of the CpG-containing immunostimulating polynucleotide in a targeted cell or cell population and comparing it to the cellular concentration of the CpG-containing immunostimulating polynucleotide in a non-targeted cell or cell population. For example, cell markers can be used identify and purify a particular cell population. Other methods for detecting and measuring targeted delivery of the CpG-containing immunostimulating polynucleotides are known to those skilled in the art, and fall within the scope of the present disclosure.

In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than a non-targeted cell or cell population by at least 2 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 5 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 10 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 20 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 30 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 40 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 50 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by at least 100 folds. In some embodiments, the targeting moiety delivers more CpG-containing immunostimulating polynucleotide to the targeted cell or cell population than to a non-targeted cell or cell population by more than 100 folds.

In some embodiments, the targeting moiety delivers the CpG-containing immunostimulating polynucleotide to a targeted cell by specifically binding to a receiving moiety located near, on and/or inside the targeted cell. In some embodiments, the targeting moiety is an antibody or an antigen-binding fragment thereof, and the receiving moiety is an antigen produced by the targeted cell or an antigen fragment thereof. In some embodiments, the receiving moiety is a cell surface antigen. In some embodiments, the receiving moiety is located within the cytosol of the targeted cell. In some embodiments, the receiving moiety is associated with an intracellular organelle of the targeted cell, such as the endosome or phagosome. In some embodiments, upon binding of the targeting moiety, the targeted cell internalizes the CpG-containing immunostimulating polynucleotide. In some embodiments, the receiving moiety facilitates internalization of the CpG-containing immunostimulating polynucleotide. In some embodiments, the targeted cell further transports the internalized CpG-containing immunostimulating polynucleotide to an intracellular compartment, such as the endosome or phagosome. In some embodiments, the receiving moiety facilitates transportation of the CpG-containing immunostimulating polynucleotide.

In some embodiments of the method of treating cancer, the targeted cell expresses at least one toll-like receptor, such as TLR 7 and/or TLR9. In some embodiments, the targeted cell is a normal immune cell, such as an antigen presenting cell (APC). In some embodiments, the targeted cell is a cancer cell, such as a B cell lymphoma cell. In some embodiments, the receiving moiety is located on the same cellular membrane as the toll-like receptor. In some embodiments, both the receiving moiety and the toll-like receptor are located on the cell membrane of the targeted cell. In some embodiments, both the receiving moiety and the toll-like receptor are located on the endosomal membrane or phagosomal membrane of the targeted cell. In some embodiments, binding of the targeting moiety to the receiving moiety facilitates binding of the CpG-containing immunostimulating polynucleotide to the TLR9 receptor expressed by the targeted cell.

In some embodiments, the CpG-containing immunostimulating polynucleotide is conjugated to an antibody or antigen binding fragment thereof to form a CpG-Ab immunoconjugate. In some embodiments, the conjugation is through covalent linkage, such as through a chemical linker molecule as provided herein. In other embodiments, the conjugation is through non-covalent linkage, such as through binding interaction between a ligand and its receptor. Other examples of non-covalent linkage that can be used in connection with the present disclosure include but are not limited to electrostatic interactions (e.g., TAT or Spermine or Protamine complexes) and biotin-avidin/streptavidin interactions.

In some embodiments, the antibody is selected from an anti-CD20 antibody, anti-CD22 antibody, anti-CD30 antibody, anti CD37 antibody, anti-CD38 antibody, anti-CD40 antibody, anti-CD74 antibody, anti-CD79b antibody, anti-CD205 antibody, anti-CD274 antibody, anti-CD303 antibody, anti-CD304 antibody, anti-CD19 antibody, anti-CD1 antibody, anti-CD2 antibody, anti-CD3 antibody, anti-CD5 antibody, anti-CD6 antibody, anti-CD9 antibody, anti-CD11 antibody, anti-CD18 antibody, anti-CD21 antibody, anti-CD23 antibody, anti-CD24 antibody, anti-CD25 antibody, anti-CD26 antibody, anti-CD44 antibody, anti-CD45R antibody, anti-CD49 antibody, anti-CD66 (Carcinoembrionic antigen, CEA) antibody, anti-CD93 antibody, anti-CD52 antibody, anti-CD56 antibody, anti-CD123 antibody, anti-CD138 antibody, anti-CD163 antibody, anti-CD206 antibody. In some embodiments, the antibody is an anti-CD20 antibody. In some embodiments, the antibody is an anti-CD22 antibody. In some embodiments, the antibody is an anti-CD30 antibody. In some embodiments, the antibody is an anti-CD38 antibody. In some embodiments, the antibody is an anti-CD40 antibody. In some embodiments, the antibody is an anti-CD74 antibody. In some embodiments, the antibody is an anti-CD76b antibody. In some embodiments, the antibody is an anti-CD205 antibody. In some embodiments, the antibody is an anti-CD274 antibody. In some embodiments, the antibody is an anti-CD303 antibody. In some embodiments, the antibody is an anti-CD304 antibody. In some embodiments, the antibody is an anti-CD19 antibody. In some embodiments, the antibody is an anti-CD1 antibody. In some embodiments, the antibody is an anti-CD2 antibody. In some embodiments, the antibody is an anti-CD3 antibody. In some embodiments, the antibody is an anti-CD5 antibody. In some embodiments, the antibody is an anti-CD6 antibody. In some embodiments, the antibody is an anti-CD9 antibody. In some embodiments, the antibody is an anti-CD11 antibody. In some embodiments, the antibody is an anti-CD18 antibody. In some embodiments, the antibody is an anti-CD21 antibody. In some embodiments, the antibody is an anti-CD23 antibody. In some embodiments, the antibody is an anti-CD24 antibody. In some embodiments, the antibody is an anti-CD25 antibody. In some embodiments, the antibody is an anti-CD26 antibody. In some embodiments, the antibody is an anti-304 antibody. In some embodiments, the antibody is an anti-CD44 antibody. In some embodiments, the antibody is an anti-CD45R antibody. In some embodiments, the antibody is an anti-CD49 antibody. In some embodiments, the antibody is an anti-CD66 (Carcinoembrionic antigen, CEA) antibody. In some embodiments, the antibody is an anti-CD93 antibody. In some embodiments, the antibody is an anti-CD52 antibody. In some embodiments, the antibody is an anti-CD56 antibody. In some embodiments, the antibody is an anti-CD123 antibody. In some embodiments, the antibody is an anti-CD138 antibody. In some embodiments, the antibody is an anti-CD163 antibody. In some embodiments, the antibody is an anti-CD206 antibody.

In some embodiments, the antibody is a monoclonal antibody. In some embodiments, the antibody is a human antibody. In some embodiments, the antibody is a humanized antibody.

In some embodiments, the CpG-Ab conjugate is one of the immunoconjugates listed in Table 6-A or 6-B of the present disclosure. In some embodiments, the CpG-Ab conjugate is selected from SB-342, SB-343, SB-341, SB-340, SB-179, SB-181, SB-186, SB-189, SB-228, SB-229, SB-242, SB-263, SB-337, SB-267, SB-284, SB-312, SB-313, SB-347, SB-373, SB-382, SB-388, SB-389, SB-408, SB-416, SB-419, SB-421, SB-423, SB-426, SB-427, SB-428, SB-429, and SB-430 as shown in Tables 6-A and 6-B.

The CpG-Ab immunoconjugate can comprise one or more CpG-containing immunostimulating polynucleotide and one or more antibody or antigen binding fragment thereof. The molecular ratios between the antibody or antigen binding fragment thereof and the CpG-containing immunostimulating polynucleotide (Ab:CpG ratio) in the immunoconjugate can range from 1:1 through 1:100. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:1. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:2. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:3. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:4. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:5. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:6. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:7. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:8. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:9. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:10. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:15. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:20. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:30. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:40. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:50. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:60. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:70. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:80. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:90. In some embodiments, the Ab:CpG ratio of the CpG-Ab immunoconjugate is 1:100.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein upon administering to the subject, the CpG-Ab immunoconjugate targets a normal immune cell. In some embodiments, the CpG-Ab immunoconjugates target one or more type(s) of normal cell selected from T cells, B cells, natural killer cells, neutrophils, mast cells, macrophages, antigen-presenting cells (APC), basophils, and eosinophils. In some embodiments, the CpG-Ab immunoconjugate targets a normal APC. In some embodiments, the CpG-Ab immunoconjugates target one or more type(s) of normal APC selected from B cells, monocytes, dendritic cells, Langerhans cells, keratinocytes, endothelial cells, astrocytes, fibroblasts, and oligodendrocytes. In some embodiments, the CpG-Ab immunoconjugate targets a normal B cell. In some embodiments, the CpG-Ab immunoconjugate targets a normal dendritic cell. In some embodiments, the CpG-Ab immunoconjugate targets a normal macrophage. In some embodiments the CpG-Ab immunoconjugates targeting one or more type(s) of normal cells do not target an abnormal cell, such as a cancer cell.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein upon administering to the subject, the CpG-Ab immunoconjugate targets a cell that expresses at least one toll-like receptor. In some embodiments, the CpG-Ab immunoconjugate targets a cell that expresses TLR9. In some embodiments, the CpG-immunoconjugate targets a cell that expresses TLR7. In some embodiments, the CpG-Ab immunoconjugate targets a TLR-expressing cell selected from dendritic cells (DCs), B cells, T cells, Langerhans cells, keratinocytes, mast cells, endothelial cells, myofibroblast cells, and primary fibroblast.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein the CpG-Ab immunoconjugate targets an abnormal cell of the cancer being treated. In some embodiments, such abnormal cell is a cancer cell. In some embodiments, such abnormal cell is a stromal cell of the tumor being treated. In some embodiments, the CpG-Ab immunoconjugate targets one or more type(s) of cancer cells selected from B cell cancer, e.g., multiple myeloma, Waldenstrom's macroglobulinemia, the heavy chain diseases, such as, for example, alpha chain disease, gamma chain disease, and mu chain disease, benign monoclonal qammopathy, and immunocytic amyloidosis, melanomas, breast cancer, lung cancer, bronchus cancer, colorectal cancer, prostate cancer, pancreatic cancer, stomach cancer, ovarian cancer, urinary bladder cancer, brain or central nervous system cancer, peripheral nervous system cancer, esophageal cancer, cervical cancer, uterine or endometrial cancer, cancer of the oral cavity or pharynx, liver cancer, kidney cancer, testicular cancer, biliary tract cancer, small bowel or appendix cancer, salivary gland cancer, thyroid gland cancer, adrenal gland cancer, osteosarcoma, chondrosarcoma, cancer of hematologic tissues, and the like. Other non-limiting examples of types of cancers applicable to the methods encompassed by the present invention include human sarcomas and carcinomas, e.g., fibrosarcoma, myxosarcoma, liposarcoma, chondrosarcoma, osteogenic sarcoma, chordoma, angiosarcoma, endotheliosarcoma, lymphangiosarcoma, lymphangioendotheliosarcoma, synovioma, mesothelioma, Ewing's tumor, leiomyosarcoma, rhabdomyosarcoma, colon carcinoma, colorectal cancer, pancreatic cancer, breast cancer, ovarian cancer, prostate cancer, squamous cell carcinoma, basal cell carcinoma, adenocarcinoma, sweat gland carcinoma, sebaceous gland carcinoma, papillary carcinoma, papillary adenocarcinomas, cystadenocarcinoma, medullary carcinoma, bronchogenic carcinoma, renal cell carcinoma, hepatoma, bile duct carcinoma, liver cancer, choriocarcinoma, sominoma, embryonal carcinoma, Wilms' tumor, cervical cancer, bone cancer, brain tumor, testicular cancer, lung carcinoma, small cell lung carcinoma, bladder carcinoma, epithelial carcinoma, glioma, astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pinealoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, melanoma, neuroblastoma, retinoblastoma; leukemias, e.g., acute lymphocytic leukemia and acute myelocytic leukemia (myeloblastic, promyelocytic, myelomonocytic, monocytic and erythroleukemia); chronic leukemia (chronic myelocytic (granulocytic) leukemia and chronic lymphocytic leukemia); and polycythemia vera, lymphoma (Hodgkin's disease and non-Hodgkin's disease), multiple myeloma, Waldenstrom's macroglobulinemia, and heavy chain disease. In some embodiments, cancers are epithlelial in nature and include but are not limited to, bladder cancer, breast cancer, cervical cancer, colon cancer, gynecologic cancers, renal cancer, laryngeal cancer, lung cancer, oral cancer, head and neck cancer, ovarian cancer, pancreatic cancer, prostate cancer, or skin cancer. In other embodiments, the cancer is breast cancer, prostate cancer, lung cancer, or colon cancer. In still other embodiments, the epithelial cancer is non-small-cell lung cancer, nonpapillary renal cell carcinoma, cervical carcinoma, ovarian carcinoma (e.g., serous ovarian carcinoma), or breast carcinoma. The epithelial cancers may be characterized in various other ways including, but not limited to, serous, endometrioid, mucinous, clear cell, Brenner, or undifferentiated.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein the CpG-Ab immunoconjugate targets an abnormal cell of the cancer being treated and also targets a normal immune cell selected from T cells, B cells, natural killer cells, neutrophils, mast cells, macrophages, antigen-presenting cells (APC), basophils, and eosinophils. In some embodiments, the CpG-Ab immunoconjugate targeting an abnormal cell of the cancer being treated also targets a normal APC selected from B cells, monocytes, dendritic cells, Langerhans cells, keratinocytes, endothelial cells, astrocytes, fibroblasts, and oligodendrocytes. In some embodiments, the CpG-Ab immunoconjugate targeting an abnormal cell of the cancer being treated also targets a cell expressing a TLR receptor selected from dendritic cells (DCs), B cells, T cells, Langerhans cells, keratinocytes, mast cells, endothelial cells, myofibroblast cells, and primary fibroblast. In particular embodiments, such abnormal cell is a cancerous immune cell. In particular embodiments, such abnormal cell is a lymphoma cell or a leukemia cell. In particular embodiments, such abnormal cell is a B cell lymphoma cell, and the CpG-Ab immunoconjugates target both the B cell lymphoma cell and normal B cells in the subject.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein the CpG-containing immunostimulating polynucleotide activates a TLR9 mediated signaling pathway upon arrival at the targeted cell. Such activation can be through binding of the CpG-containing immunostimulating polynucleotide with the TLR9 receptor expressed on the surface or within the cytosol of the targeted cell. In some embodiments, the cell targeted by the CpG-Ab immunoconjugate is capable of internalizing the CpG-Ab immunoconjugate. In some embodiments, the cell targeted by the CpG-Ab immunoconjugate is capable of internalizing the CpG-containing immunostimulating polynucleotide portion of the immunoconjugate. In some embodiments, the cell targeted by the CpG-Ab immunoconjugate is capable of transporting the internalized CpG-Ab immunoconjugate or the CpG-containing immunostimulating polynucleotide portion thereof to a intracellular organelle that expressed a TLR receptor. In some embodiments, the cell targeted by the CpG-Ab immunoconjugate is capable of transporting the internalized CpG-Ab immunoconjugate or the CpG-containing immunostimulating polynucleotide portion thereof to the endosome or phagosome of the cell.

In some embodiments, the method for treating cancer comprises administering to a subject having cancer a therapeutic effective amount of a CpG-Ab immunoconjugate, wherein the CpG-Ab immunoconjugate specifically binds to an antigen associated with a targeted cell. As described herein, an antigen associated with a targeted cell may be found on the surface and/or or within the cytosol of the target cell. In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen present on the surface of a targeted cell. In some embodiments, CpG-Ab immunoconjugate specifically binds to an antigen present within the cytosol of a targeted cell. In some embodiments, CpG-Ab immunoconjugate specifically binds to an antigen present on the membrane of an intracellular compartment or organelle of a targeted cell. In some embodiments, CpG-Ab immunoconjugate specifically binds to an antigen reside on the endosomal or phagosomal membrane of the targeted cell. In some embodiments, upon binding by the CpG-Ab immunoconjugate, the target antigen facilitates internalization of the CpG-Ab immunoconjugate or the CpG-containing immunostimulating polynucleotide into the targeted cell. In some embodiments, upon binding by the CpG-Ab immunoconjugate, the target antigen facilitates transportation of the CpG-Ab immunoconjugate or the CpG-containing immunostimulating polynucleotide to the endosome of the targeted cell. In some embodiments, upon binding by the CpG-Ab immunoconjugate, the target antigen facilitates binding of the CpG-containing immunostimulating polynucleotide to TLR9 expressed by the targeted cell.

In some embodiments, an antigen associated with a targeted cell is a protein encoded and expressed by the targeted cell. In those embodiments, the protein antigen can be encoded by an endogenous gene (e.g., encoded by the targeted cell genome) or exogenous gene (e.g., encoded by a gene artificially introduced to the targeted cell) of the targeted cell. In other embodiments, the target antigen of the CpG-Ab immunoconjugate is not encoded or expressed by the targeted cell. In some embodiments, an antigen associated with a targeted cell is an exogenous antigen uptaken by the targeted cell (e.g., an antigen endocytosed and processed by an APC).

As non-limiting examples, in some embodiments, for targeting a normal immune cell, the target antigen of the CpG-Ab immunoconjugate is encoded and expressed by the normal immune cell (e.g., a B cell antigen). In some embodiments, the target antigen of the CpG-Ab immunoconjugate is encoded by an endogenous gene of the normal immune cell. In some embodiments, the target antigen of the CpG-Ab immunoconjugate is encoded by an exogenous gene introduced into the normal immune cell (e.g., a reporter gene). In some embodiments, the target antigen of the CpG-Ab immunoconjugate is a disease antigen taken up and processed by the immune cell (e.g., a tumor associated antigen or a viral antigen).

As non-limiting examples, in some embodiments, for targeting an abnormal cell (e.g., a cancer cell or a pathogen infected cell), the target antigen of the CpG-Ab immunoconjugate may be a protein encoded by an endogenous gene of the abnormal cell. In various embodiments, the target antigen of the CpG-Ab immunoconjugate is overexpressed, mutated or misregulated in the targeted cell. In other embodiments, the target antigen of the CpG-Ab immunoconjugate has the same features as the antigen would have in a normal cell. In other embodiments, the target antigen of the CpG-immunoconjugate is encoded by an exogenous gene introduced into the abnormal cell (e.g., through pathogen infection).

In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a normal immune cell selected from T cells, B cells, natural killer cells, neutrophils, mast cells, macrophages, antigen-presenting cells (APC), basophils, and eosinophils. In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a normal antigen-presenting cells (APC) selected from B cells, monocytes, dendritic cells, Langerhans cells, keratinocytes, endothelial cells, astrocytes, fibroblasts, and oligodendrocytes. In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a normal B cell. In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a normal dendritic cell. In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a macrophage cell.

In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen encoded and expressed by a normal immune cell selected from immune checkpoint molecules, T cell costimulatory molecules, MHC proteins (including MHC class I and II molecules), and other immune cell specific antigens.

In particular embodiments, immune checkpoint molecules finding use in the present disclosure include but are not limited to PD-1, PD-L1, PD-L2, TIM-3, LAG-3, CEACAM-1, CEACAM-5, CLTA-4, VISTA, BTLA, TIGIT, LAIR1, CD47, CD160, 2B4 and TGFR.

In particular embodiments, T cell costimulatory molecules finding use in the present disclosure include but are not limited to OX40, CD2, CD27, CDS, ICAM-1, LFA-1/CD11a/CD18, ICOS/CD278, 4-1 BB/CD137, GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3, and CD83.

In particular embodiments, B cell specific antigens finding use in the present disclosure include but are not limited to B220/CD45R, B7-1/CD80, B7-2/CD86, BCMA/TNFRSF17, BLIMP1/PRDM1, Clq R1/CD93, CD117/c-kit, CD11b/Integrin alpha M, CD19, CD1c/BDCA-1, CD1d, CD20, CD21, CD23/Fc epsilon RII, CD24, CD25/IL-2R alpha, CD27/TNFRSF7, CD34, CD37, CD38, CD40/TNFRSF5, CD43, CD5, CD69, CD72, CD83, CXCR4, CXCR5, DEP-1/CD148, EMMPRIN/CD147, FCRL3/FcRH3, Flt-3/Flk-2, HLA-DR, IgM, IL-10, IL-12 R beta 2, IL-12/IL-35 p35, IL-21, IL-21 R, IL-27 R alpha/WSX-1/TCCR, IL-27/IL-35 EB13 Subunit, IL-3 R alpha/CD123, IL-4 R alpha, IL-7 R alpha/CD127, IRF4, MHC class II (I-A/I-E), Neprilysin/CD10, Pax5/BSAP, Sca-1/Ly6, Siglec-2/CD22, STAT1, STAT3, Syndecan-1/CD138, TACI/TNFRSF13B, TGF-beta, TIM-1/KIM-1/HAVCR, TLR4. In particular embodiments, B cell specific antigens are selected from CD1, CD2, CD5, CD9, CD11, CD17, CD18, CD19, CD20, CD21/CD35, CD22, CD23, CD24, CD25, CD27, CD30, CD38, CD40, CD45R/B220, CD69, CD70, CD78, CD79a (Iga), CD79b (Igp), CD80, CD86, CD93 (C1Rqp), CD137/4-1 BB, CD138, CD252/OX40L, CD267, CD268/BAFF-R, CD279/PD1, CD319, PDL-2, Pax-5, IgD, IgM, Notch 2, and TLR4.

In particular embodiments, dendritic cell specific antigens finding use in the present disclosure include but are not limited to B220/CD45R, BATF3, BST-2/Tetherin, CD11b/Integrin alpha M, CD11c, CD14, CD163, CD19, CD1c/BDCA-1, CiD1d, CD20, CD3, CD4, CD8, CLEC9a, CX3CR1, DC-SIGN/CD209, DEC-205/CD205, DLEC/CLEC4C/BDCA-2, E-Cadherin, EpCAM/TROP1, F4/80, Fc epsilon RI alpha, Fc gamma RI/CD64, Fc gamma RIA/CD64, Fc gamma RIB/CD64, Fc gamma RIII (CD16), Fc gamma RIIIA/CD16a, Fcgamma RIIIB/CD16b, GFI-1, HLA-DR, IFN-alpha, IFN-beta, IFN-gamma, IGSF4A/SynCAM1, Ikaros, IL-1 beta/IL-1F2, IL-10, IL-12, IL-2, IL-23, IL-3 R alpha/CD123, IL-6, iNOS, Integrin alpha E/CD103, IRF4, IRF8, Langerin/CD207, Ly-6G (Gr-1), Ly-6G/Ly-6C (Gr-1), MHC class II (I-A/I-E), MMR/CD206, NCAM-1/CD56, Neuropilin-1, NFIL3/E4BP4, Nitric Oxide, PU.1/Spi-1, SIRP alpha/CD172a, Spi-B, Thrombomodulin/BDCA-3, TLR7, TLR9, TNF-alpha, and XCR1. Additional dendritic cell antigens and antibodies specifically binding to dendritic cell antigens are known in the art, such as those described in Rafael Nuñez Current Protocols in Cytometry (2001) 9.17.1-9.17.15; Hock et al., Immunology 1994, 83:573-581; Jiang et al., Nature 1995, 375:151-155; Bender et al., J. Immunol. Methods 1996, 196:121-135; and Colli et al., Immunology 2013, 140:22-30; the content of each of which is incorporated herein by reference in its entirety. In particular embodiments, dendritic cell specific antigens are selected from CD1a, CD1b/c, CD4, CD8, CD11b, CD11c, CD40, CD45R/B220, CD49d, CD80, CD83, CD85a, CD85f, CD85g/ILT7, CD85i, CD85j, CD86, CD123, CD197/CCR7, CD205, CD206, CD207, CD208, CD209, CD273/B7-DC/PD-L2, CD303/BDCA-2, CD304/neuropilin-1, DC marker/33D1, F4/80, MHC class I, fascin, HLA-DR and Siglec H. In particular embodiments, dendritic cell specific antigens are plasmacytoid dendritic cell antigens selected from CD1a, CD1 b, CD1c, CD4, CD8, CD11 b, CD11c, CD40, CD45R/B220, CD49d, CD80, CD83, CD85g/ILT7, CD86, CD123, CD197 (CCR7), CD273 (B7-DC, PD-L2), CD303 (BDCA-2), CD304 (Neuropilin-1), DC Marker (33D1), F4/80, HLA-DR, MHC Class II, Siglec H.

In particular embodiments, macrophage surface antigens finding use in the present disclosure include but are not limited to Activin A, AIF-1/Iba1, Arginase 1/ARG1, B7-1/CD80, B7-2/CD86, Calcitonin R, CCL1/I-309/TCA-3, CCL11/Eotaxin, CCL14/HCC-1/HCC-3, CCL15/MIP-1 delta, CCL16/HCC-4, CCL17/TARC, CCL18/PARC, CCL19/MIP-3 beta, CCL2/JE/MCP-1, CCL20/MIP-3 alpha, CCL22/MDC, CCL23/Ck beta 8-1, CCL23/MPIF-1, CCL24/Eotaxin-2/MPIF-2, CCL26/Eotaxin-3, CCL3/CCL4, CCL3/MIP-1 alpha, CCL4/MIP-1 beta, CCL5/RANTES, CCL8/MCP-2, CCR2, CCR5, CD11b/Integrin alpha M, CD11c, CD15/Lewis X, CD163, CD200 R1, CD200R1L, CD36/SR-B3, CD43, CD45, CD68/SR-D1, CLEC10A/CD301, COX-2, CX3CL1/Fractalkine, CX3CR1, CXCL1/GRO alpha/KC/CINC-1, CXCL10/IP-10/CRG-2, CXCL11/I-TAC, CXCL13/BLC/BCA-1, CXCL16, CXCL2/GRO beta/MIP-2/CINC-3, CXCL3/GRO gamma/CINC-2/DCIP-1, CXCL5/ENA-70, CXCL5/ENA-74, CXCL5/ENA-78, CXCL9/MIG, CXCR1/IL-8 RA, CXCR2/IL-8 RB, DC-SIGN/CD209, DEC-205/CD205, Dectin-1/CLEC7A, Dectin-2/CLEC6A, EMR1, F4/80, Fc epsilon RI alpha, Fc gamma RI/CD64, Fc gamma RIA/CD64, Fc gamma RIB/CD64, Fc gamma RII/CD32, Fc gamma RIII (CD16), FIZZ1/RELM alpha, Galectin-3, GATA-6, G-CSF, GITR Ligand/TNFSF18, GM-CSF, HLA-DR, ID2, IFN-gamma, IFN-gamma R1/CD119, IL-1 beta/IL-1F2, IL-1 RII, IL-10, IL-15, IL-17/IL-17A, IL-18/IL-1F4, IL-1ra/IL-1F3, IL-23, IL-4 R alpha, IL-6, IL-8/CXCL8, iNOS, Integrin alpha L/CD11a, IRF4, IRF5, LAMP-2/CD107b, Langerin/CD207, LILRB4/CD85k/ILT3, L-Selectin/CD62L, LXR alpha/NR1H3, Ly-6G (Gr-1), Ly-6G/Ly-6C (Gr-1), MARCO, M-CSF R/CD115, Mer, MFG-E8, MHC class II (I-A/I-E), MMR/CD206, NFATC1, NGFI-B alpha/Nur77/NR4A1, PPAR delta/NR1C2, PPAR gamma/NR1C3, RANK/TNFRSF11A, RUNX3/CBFA3, Siglec-1/CD169, Siglec-3/CD33, Siglec-F, SIGNR1/CD209b, SIRP alpha/CD172a, SLAM/CD150, SOCS-3, Sphingosine Kinase 1/SPHK1, Sphingosine Kinase 2/SPHK2, SR-AI/MSR, SR-BI, STAT1, STAT6, TGF-beta, TIM-4, TLR1, TLR2, TLR4, TLR8, TNF-alpha, TRACP/PAP/ACP5, VCAM-1/CD106, VEGF, and YM1/Chitinase 3-like 3. In particular embodiments, macrophage specific antigens are selected from CD11a, CD11b, CD11c, CD14, CD15 (SSEA-1), CD16/32, CD33, CD64, CD68, CD80, CD85k (ILT3), CD86, CD105 (Endoglin), CD107b, CD115, CD163, CD195 (CCR5), CD282 (TLR2), CD284 (TLR4), F4/80, GITRL, HLA-DR, Mac-2 (Galectin-3), MHC Class II.

In particular embodiments, T cell specific antigens finding use in the present disclosure include but are not limited to CD3, CD4, CD8, CD25, CD127, and CD196/CCR6, CD197/CCR7, CD62L, CD69, and CD45RO.

In particular embodiments, T Follicular helper cell specific antigens finding use in the present disclosure include but are not limited to BCL-6, Stat-3, CD3, CD4, CD84, CD126/IL-6Rα, CD150/SLAM), CD154/CD40L, CD185/CXCR5, CD252/OX40L, CD278/ICOS, CD279/PD1, and TCR α/β. In particular embodiments, Th1 cell specific antigens finding use in the present disclosure include but are not limited to GM-CSF, IFN-γ, IL-2, T-bet, Extracellular Markers, CD4, CD26, CD94, CD119, CD183, CD191 (CCR1), CD195 (CCR5), CD254 (TRANCE, RANKL), CD366 (Tim-3), IL-18R, Lymphotoxin beta receptor (LTPR), TNF-α, and TNF-β. In particular embodiments, Th2 cell specific antigens finding use in the present disclosure include but are not limited to c-MAF, GATA3, GM-CSF, IL-4, IL-5, IL-6, IL-10, IL-13, Extracellular Markers, CCR8, CD4, CD184 (CXCR4), CD193 (CCR3), CD194 (CCR4), CD197 (CCR7), CD278 (ICOS), CD294 (CRTH2), CD365 (Tim-1), and IL-1R. In particular embodiments, Th9 cell specific antigens finding use in the present disclosure include but are not limited to GATA3, IRF4, Stat-6, CD3, CD4, and TCR α/β. In particular embodiments, Th17 cell specific antigens finding use in the present disclosure include but are not limited to IL-17A, IL-17F, IL-21, IL-22, RORα, RORγt, Stat-3, CD3, CD4, CD38, CD161/NK-1.1, CD194/CCR4, CD196/CCR6, IL-1R and TGF-β. In particular embodiments, Th22 cell specific antigens finding use in the present disclosure include but are not limited to AHR, CCR10, CD3, CD$, CD194/CCR4, CD196/CCR6, and TCR α/β. In particular embodiments, Treg cell specific antigens finding use in the present disclosure include but are not limited to FOXP3, Helios, Extracellular Markers, CD4, CD25, CD39, CD62L, CD73, CD103, CD134, CD152/CTLA-4, CD194/CCR4, CD223, FR4, GARP, GITR, and TGF-β.

In particular embodiments, natural killer cell specific antigens finding use in the present disclosure include but are not limited to CD11b, CD11c, CD16/32, CD49b, CD56 (NCAM), CD57, CD69, CD94, CD122, CD158 (Kir), CD161 (NK-1.1), CD244 (2B4), CD314 (NKG2D), CD319 (CRACC), CD328 (Siglec-7), CD335 (NKp46), Ly49, Ly108, Vα24-Jα18 TCR (iNKT), Granulysin, Granzyme, and Perforin.

In particular embodiments, endothelial cell specific antigens finding use in the present disclosure include but are not limited to CD31, CD34, CD54, CD61, CD62E/E-Selectin, CD105/Endoglin, CD106/VCAM-1, CD144/VE-Cadherin, CD146/MUC18, Mel-CAM, CD201/EPCR, CD202b/Tie2/Tek, CD309/VEGFR2-Flk-1, Podoplanin, and VEGFR3. In particular embodiments, basophil cell specific antigens finding use in the present disclosure include but are not limited to Pro-Major Basic Protein 1, CD13, CD44, CD54, CD63, CD69, CD107a, CD123, CD193/CCR3, CD203c, FcεRIα, IgE, and TLR4. In particular embodiments, astrocyte cell specific antigens finding use in the present disclosure include but are not limited to S100B, CD40, CD80, CD86, CD88, and GFAP. In particular embodiments, eosinophil cell specific antigens finding use in the present disclosure include but are not limited to C3AR, CD15 (SSEA-1), CD23, CD49d, CD52, CD53, CD88, CD129, CD183, CD191, CD193, CD244 (2B4), CD294, CD305, FcεRIα, Galectin-9, MRP-14, Siglec-8, and Siglec-10. In particular embodiments, mast cell specific antigens finding use in the present disclosure include but are not limited to CD117/C-kit, CD203c and FcεRIα. In particular embodiments, fibroblast cell specific antigens finding use in the present disclosure include but are not limited to CD10, CD29, CD47, CD81, CD91, CD121a.

In particular embodiments, the CpG-Ab immunoconjugate specifically binding to an target antigen associated with a normal immune cell that is selected from CD19, CD20, CD22, CD30, CD38, CD40, CD74, CD79b, CD205, CD274, CD303, and CD304. In particular embodiments, the CpG-Ab immunoconjugate specifically binding to an target antigen selected from CD19, CD20, CD22, CD30, CD38, CD40, CD74, CD79b, CD205, CD274, CD303, and CD304.

In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a normal immune cell (e.g., an APC) does not target an abnormal cell. In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a normal immune cell (e.g., an APC) does not bind to an antigen associated with an abnormal cell. In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a normal immune cell (e.g., an APC) does not bind to a tumor associated antigen of the cancer being treated with the method provided herein.

In some embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a TLR-expressing cell selected from keratinocytes, Langerhans cells, T cells, B cells, mast cells, endothelial cells, myofibroblast cells, and primary fibroblast cells. In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a TLR-expressing cell does not target an abnormal cell. In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a TLR-expressing cell does not bind to an antigen associated with an abnormal cell. In some embodiments, the CpG-Ab immunoconjugate specifically binding to an antigen associated with a TLR-expressing cell does not bind to tumor associated antigen of the cancer being treated with the method provided herein.

In some embodiments, the CpG-Ab immunoconjugate specifically binds to a tumor associated antigen of the cancer being treated by the present method. Examples of tumor associated antigens (TAAs) that can be targeted by the CpG-Ab immunoconjugate of the present disclosure include, but are not limited to, sequences comprising all or part of the sequences of EGFR, EGFRvIII, gp100 or Pmel17, HER2/neu, mesothelin, CEA, MART-1/Melan-A, MAGE-A1, MAGE-A2, MAGE-A3, MAGE-A4, MUC-1, GPNMB, HMW-MAA, TIM1, ROR1, CD19, gp100, Dipeptidyl peptidase IV (DPPIV), adenosine deaminase-binding protein (ADAbp), cyclophilin b, Colorectal associated antigen (CRC)-C017-1A/GA733, Carcinoembryonic Antigen (CEA) and its immunogenic epitopes CAP-1 and CAP-2, etv6, aml1, Prostate Specific Antigen (PSA) and its immunogenic epitopes PSA-1, PSA-2, and PSA-3, prostate-specific membrane antigen (PSMA), T-cell receptor/CD3-zeta chain, MAGE-family of tumor antigens (e.g., MAGE-A1, MAGE-A2, MAGE-A3, MAGE-A4, MAGE-A5, MAGE-A6, MAGE-A7, MAGE-A8, MAGE-A9, MAGE-A10, MAGE-A11, MAGE-A12, MAGE-Xp2 (MAGE-B2), MAGE-Xp3 (MAGE-B3), MAGE-Xp4 (MAGE-B4), MAGE-C1, MAGE-C2, MAGE-C3, MAGE-C4, MAGE-05), GAGE-family of tumor antigens (e.g., GAGE-1, GAGE-2, GAGE-3, GAGE-4, GAGE-5, GAGE-6, GAGE-7, GAGE-8, GAGE-9), BAGE, RAGE, LAGE-1, NAG, GnT-V, MUM-1, CDK4, tyrosinase, p53, MUC family (e.g. MUC1, MUC16, etc; see e.g. U.S. Pat. No. 6,054,438; WO98/04727; or WO98/37095), p21ras, RCAS1, alpha-fetoprotein, E-cadherin, alpha-catenin, beta-catenin and gamma-catenin, p120ctn, PRAME, NY-ESO-1, cdc27, adenomatous polyposis coli protein (APC), fodrin, Connexin 37, Ig-idiotype, p15, gp75, GM2 and GD2 gangliosides, Smad family of tumor antigens brain glycogen phosphorylase, SSX-1, SSX-2 (HOM-MEL-40), SSX-1, SSX-4, SSX-5, SCP-1 and CT-7, and c-erbB-2 and viral antigens such as the HPV-16 and HPV-18 E6 and E7 antigens and the EBV-encoded nuclear antigen (EBNA)-1 as well as markers (beta-galactosidase, luciferase . . . ), βhCG, WT1, TRP-2, NY-BR-1, NY-CO-58, MN (gp250), Telomerase, and germ cell derived tumor antigens. Tumor associated antigens also include the blood group antigens, for example, Lea, Leb, LeX, LeY, H-2, B-1, B-2 antigens. Tumor associated antigen can be identified using methods known in the art, such as disclosed in Zhang et al. Supra.

Particularly, in some embodiments, the CpG-Ab immunoconjugate specifically binds to a tumor associated antigen selected from CD19, CD20, CD22, CD25, CD30, CD33, CD38, CD40, CD44, CD45R (B220), CD49, CD52, CD56, CD70, CD74, CD79a, CD79b, CD93, CD123, CD138, CD163, CD205, CD206, CD274, CD303, and CD304, folate receptor alpha, folate receptor beta, mesothelin, PSMA, Her-2, EGFR, transferrin receptor, integrin, cripto, EphA2, AGS-5, AGS-16, CanAg, EpCAM, IL4 receptor, IL2 receptor, Lewis Y, GPNMB.

In other embodiments, the CpG-Ab immunoconjugate does not bind to a tumor associated antigen selected from CD19, CD20, CD22portin 7, Her2, Src, EGFR, CD52, CXCR-4, Muc-1 and DNA.

In some embodiments, the tumor associated antigen is associated with one or more normal immune cells. In some embodiments, the tumor associated antigen is also associated with one or more TLR-expressing cells. In particular embodiments, the tumor associated antigen is a protein encoded and expressed by a normal immune cell. In particular embodiments, the normal immune cell has been artificially engineered to contain or express the tumor associated antigen. In particular embodiments, the tumor associated antigen is an exogenous antigen taken up and processed by an APC. In particular embodiments, the cancer is an immune cell cancer, and the CpG-Ab immunoconjugates targets both cancerous immune cells and normal immune cells by specifically binding to the tumor associated antigen. In particular embodiments, the cancer is lymphoma or leukemia. In particular embodiments, the cancer is B cell lymphoma.

In some embodiments of the methods of treating cancer as described herein, the cancer being treated with the methods disclosed herein is a solid tumor. In some embodiments, the cancer being treated with the methods disclosed herein is a liquid tumor. In particular embodiments, the cancer being treated with the methods disclosed herein is a lymphoma or a leukemia. In particular embodiments, the cancer being treated with the methods disclosed herein is selected from the list consisting of mantle cell cymphoma (MCL), diffuse large B-cell lymphoma (DLBCL), Burkitts lymphoma, multiple melanoma (MM), chronic lymphocytic leukemia (CLL), acute myeloid leukemia (AML), small lymphocytic lymphoma (SLL), hairy cell leukemia (HCL), lymphoplasmacytic lymphoma (LPL), skeletal muscle lymphoma (SML), splenic marginal zone lymphoma (SMZL), follicle center lymphoma (FCL), colorectal cancer, non-small cell lung cancer (NSCLC), head and neck cancer, breast cancer, pancreatic cancer, glioblastoma (GBM), prostate cancer, esophageal cancer, renal cell carcinoma, hepatic carcinoma, bladder cancer and gastric carcinoma.

In some embodiments, the cancer being treated with the methods disclosed herein is resistant to at least one immunotherapy. In some embodiments, the method of treating cancer comprises co-administering to a subject having cancer (i) a therapeutic effective amount of the CpG-containing immunostimulating polynucleotide or the CpG-Ab immunoconjugate; and (ii) the immunotherapeutic agent which the cancer being treated has shown to resist or not to respond, when the cancer is treated with the immunotherapeutic agent alone.

In particular embodiments, the cancer being treated with the methods provided herein has been shown to not to respond to a treatment with an immune checkpoint modulator. In particular embodiments, the immune checkpoint modulator is an inhibitor of PD-1. In particular embodiments, the immune checkpoint modulator is an inhibitor of PD-L1. In some embodiments, the method of treating cancer comprises co-administering to a subject having cancer (i) a therapeutic effective amount of the CpG-containing immunostimulating polynucleotide or the CpG-Ab immunoconjugate; and (ii) a therapeutic effective amount of the inhibitor of PD-1. In some embodiments, the method of treating cancer comprises co-administering to a subject having cancer (i) a therapeutic effective amount of the CpG-containing immunostimulating polynucleotide or the CpG-Ab immunoconjugate; and (ii) a therapeutic effective amount of the inhibitor of PD-L1. In particular, in some embodiments, the inhibitor of PD-1 is an anti-PD-1 antibody or an antigen binding fragment thereof. In some embodiments, the inhibitor of PD-L1 is an anti-PD-L1 antibody or an antigen binding fragment thereof.

In certain aspects, provided herein are methods of preventing cancer in a subject susceptible of developing cancer, comprising administering to the subject a therapeutic effective amount of a TLR agonist as described herein. In some embodiments, the method comprising administering to the subject an therapeutic effective amount of a CpG-containing immunostimulating polynucleotide or a CpG-Ab immunoconjugate described herein. In particular embodiments, the CpG-Ab immunoconjugate targets a normal immune cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate targets a TLR-expressing cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a normal immune cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a normal immune cell does not bind to a tumor associated antigen of the cancer being prevented. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a TLR-expressing cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a TLR-expressing cell does not bind to a tumor associated antigen of the cancer being prevented. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to a tumor associated antigen of the cancer being prevented as described herein. In particular embodiments, a tumor associated antigen of the cancer being prevented is also associated with a normal immune cell or a TLR-expressing cell. In particular embodiments, the CpG-Ab immunoconjugate does not specifically bind to an antigen selected from CD19, CD20, CD22, STAT3, exportin 7, Her2, Src, EGFR, CD52, CXCR-4, Muc-1 and DNA.

In some embodiments, the methods of preventing cancer further comprises administering to a subject susceptible to developing cancer (i) a therapeutic effective amount of a CpG-Ab immunoconjugate and (ii) a tumor associated antigen of the cancer being prevented. In some embodiments, the tumor associated antigen is not conjugated to the CpG-Ab immunoconjugate. In particular embodiments, the tumor associated antigen is formulated as a cancer vaccine. In particular embodiments, the CpG-Ab immunoconjugate is formulated as an adjuvant of the cancer vaccine.

In some embodiments, the cancer being prevented or treated using the methods provided herein is an episode of cancer recurrence in a subject who is in partial or complete remission of a prior cancer. In particular embodiments, the prior cancer is a liquid cancer and the recurrent cancer being prevented or treated is a liquid cancer. In particular embodiments, the prior cancer is a solid cancer and the recurrent cancer being prevented or treated is a solid cancer. In particular embodiments, the prior cancer is a liquid cancer and the recurrent cancer being prevented or treated is a solid cancer. In particular embodiments, the prior cancer is a solid cancer and the recurrent cancer being prevented or treated is a liquid cancer.

In some embodiments, the cancer being prevented or treated using the methods provided herein is first episode of cancer recurrence in the subject after the subject showed partial or complete remission. In some embodiments, the cancer being prevented or treated using the methods provided herein is second episode of cancer recurrence in the subject after the subject showed partial or complete remission. In some embodiments, the cancer being prevented or treated using the methods provided herein is third episode of cancer recurrence in the subject after the subject showed partial or complete remission. In some embodiments, the cancer being prevented or treated using the methods provided herein is an episode of cancer recurrence subsequent to the third episode of cancer recurrence in the subject after the subject showed partial or complete remission.

In certain aspects, provided herein are methods of inducing an adaptive immune response in a subject in need thereof, wherein method comprises administering to the subject an therapeutic effective amount of a TLR agonist as described herein. In particular embodiments, the method of inducing an adaptive immune response comprises administering to the subject in need thereof an therapeutic effective amount of a CpG-containing immunostimulating polynucleotide or a CpG-Ab immunoconjugate described herein. In particular embodiments, the CpG-Ab immunoconjugate targets a normal immune cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate targets a TLR-expressing cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate targets a diseased cell selected from a cancer cell or a pathogen infected cell. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a normal immune cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a normal immune cell does not bind to a disease antigen. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a TLR-expressing cell as described herein. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to an antigen associated with a TLR-expressing cell does not bind to a disease antigen. In particular embodiments, the CpG-Ab immunoconjugate specifically binds to a disease antigen as described herein. In particular embodiments, the diseased antigen is also associated with a normal immune cell or a TLR-expressing cell. In particular embodiments, the diseased antigen is a tumor associated antigen or a pathogenic antigen. In particular embodiments, the CpG-Ab immunoconjugate does not specifically bind to an antigen selected from CD19, CD20, CD22, STAT3, exportin 7, Her2, Src, EGFR, CD52, CXCR-4, Muc-1 and DNA.

In some embodiments of the methods and uses described herein, the CpG-containing immunostimulating polynucleotide is administered to a subject in need thereof at a dosage that is sufficient for activating the TLR9-mediated signaling pathway in the subject. In some embodiments, the CpG-Ab immunoconjugate is administered to a subject in need thereof at a dosage that is sufficient for activating the TLR9 mediated signaling pathway in a cell population targeted by the CpG-Ab immunoconjugate. As described herein, in some embodiments, the cell population targeted by the CpG-Ab immunoconjugate expresses TLR9. In some embodiments, the cell population targeted by the CpG-Ab immunoconjugate can express the TLR9 on the cell surface of the targeted cell, on the endosomal membrane of the targeted cell, or both on the cell surface and on the endosomal membrane of the targeted cell.

Particularly, in some embodiments of the methods and uses described herein, the CpG-containing immunostimulating polynucleotide is administered to a subject in need thereof at a dosage that is effective for inducing one or more of effects selected from (a) specifically binding to a TLR9 receptor by the CpG-containing immunostimulating polynucleotide on a targeted cell; (b) efficient internalization of the CpG-Ab immunoconjugate or the CpG-containing immunostimulating polynucleotide portion thereof by a targeted cell; (c) activating one or more signaling pathways in the targeted cell; (d) inducing secretion of one or more inflammatory cytokines by the targeted cell; (e) suppressing secretion of one or more inflammatory cytokines by the targeted cell; (f) upregulating expression of one or more genes of the targeted cell; (g) supressing expression of one or more genes of the targeted cell; (h) activating targeted normal immune cells, and (i) inducing apoptosis of a targeted cancer cell, ( ) inducing necrosis of targeted cancer cell.

Particularly, in some embodiments of the methods and uses described herein, wherein upon administration of the CpG-Ab immunoconjugate, the CpG-containing immunostimulating polynucleotide specifically binds to a TLR9 receptor of the targeted cell. Particularly, in some embodiments, binding of CpG-Ab immunoconjugate to an antigen associated with a targeted cell facilitates specific binding of the CpG-containing immunostimulating polynucleotide to a TLR9 receptor. In some embodiments, the target antigen of the CpG-Ab immunoconjugate is located near the TLR9 receptor. In particular embodiments, both the target antigen and the TLR9 receptor locate on the cell membrane of the targeted cell. In particular embodiments, both the target antigen and the TLR9 receptor locate on an intracellular membrane of the targeted cell. In particular embodiments, both the target antigen and the TLR9 receptor locate on the endosomal or phagosomal membrane of the targeted cell. In some embodiments, the target antigen locates on the cell membrane and facilitates internalization of the CpG-Ab immunoconjugate into the cytosol upon binding to the CpG-Ab immunoconjugate.

Particularly, in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a normal immune cell, wherein upon administration of the CpG-Ab immunoconjugate, one or more immunogenic signaling pathways in the targeted cell are activated. In particular embodiments, the activated signaling pathways are one or more selected from the nuclear factor (NF)-κB signaling pathway, the c-Jun N-terminal kinase (JNK) signaling pathway, the AP1 signaling pathway, the IRF3/7 pathway, and the p38 mitogen-activated protein kinase (MAPK) signaling pathway. The activation of a cellular signaling pathway can be detected using methods known in the art, such as but not limited to, detecting the presence of a molecular marker of which the expression is specifically induced upon activation of the signaling pathway of interest.

Particularly, in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a normal immune cell, wherein upon administration of the CpG-Ab immunoconjugate, secretion of one or more inflammatory cytokines is induced. In particular embodiments, the one or more inflammatory cytokines are selected from type I interferon (IFN), interleukin (IL)-6, IL10, IL-12, IL-18, and tumor necrosis factor (TNF).

Particularly, in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a normal immune cell, wherein upon administration of the CpG-Ab immunoconjugate, expression of one or more additional proteins are upregulated. In particular embodiments, the upregulated proteins are one or more selected from antigen presenting molecules (e.g., MHC class I and II), cytokine receptors (e.g., IL-6 receptors, IL-10 receptors, IL-12 receptors, TNF-α receptor, TNF-β receptor, IFN-α receptor, IFN-β receptor, IFN-γ), chemokine receptors (e.g., chemokine receptor 7), T cell costimulatory molecules (e.g., CD3, CD28, CD27, CD30, CD40, CD80/B7-1, CD86/B7-2, CD134/OX-40, OX-40L, CD137/4-1 BB, 4-1 BBL, CD278/ICOS, B7-H3, B7h/B7RP-1, LIGHT etc.), and T cell maturation regulatory proteins (e.g., indoleamine 2,3-dioxygenase).

Particularly, in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a normal immune cell, wherein upon administration of the CpG-Ab immunoconjugate, proliferation, differentiation, maturation and/or survival of one or more populations of normal immune cells are increased. In particular embodiments, the one or more increased populations of normal immune cells are selected from CD4+ T cells, CD8+ T cells, natural killer cells, T helper cells, B cells, and APCs (including mDCs). in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a normal immune cell, wherein upon administration of the CpG-Ab immunoconjugate, proliferation, differentiation, maturation and/or survival of one or more populations of normal immune cells are reduced. In particular embodiments, the one or more reduced populations of normal immune cells is selected from B-reg cells and T-reg cells.

In particular embodiments, upon administration of the CpG-Ab immunoconjugate, antigen presentation activities are increased in APCs in the subject. In some embodiments, the APC is selected from B cells, monocytes, dendritic cells, and Langerhans cells, keratinocytes, endothelial cells, astrocytes, fibroblasts, and oligodendrocytes. In particular embodiments, the APC is B cells. In particular embodiments, the APC is dendritic cells. In particular embodiments, the APC is macrophage. In some embodiments, the dendritic cell is pDC. In particular embodiments, the increased antigen presentation activities lead to more efficient presentation of a tumor associated antigen by the activated APCs.

In particular embodiments, upon administration of the CpG-Ab immunoconjugate, antigen-specific CD4+ T cell mediated immunity against one or more tumor associated antigen of the cancer being treated or prevented is increased. In particular embodiments, upon administration of the CpG-Ab immunoconjugate, tumor infiltration by CD4+ T cell is increased. In particular embodiments, upon administration of the CpG-Ab immunoconjugate, antigen-specific CD8+ T cell mediated immunity against one or more tumor associated antigen of the cancer being treated or prevented is increased is increased. In particular embodiments, upon administration of the CpG-Ab immunoconjugate, tumor infiltration by CD8+ T cell is increased. In particular embodiments, upon administration of the CpG-Ab immunoconjugate, B cell secretion of immunoglobulin specifically against one or more tumor associated antigen of the cancer being treated or prevented is increased is increased.

Particularly, in some embodiments of the methods and uses described herein, the method comprises administering to a subject in need thereof, a therapeutic effective amount of a CpG-Ab immunoconjugate targeting a diseased cell, wherein upon administration of the CpG-Ab immunoconjugate, one or more apoptotic signaling pathways are induced trigger apoptosis of the targeted diseased cell. In some embodiments, the diseased cell is a cancer cell.

In some embodiments of the methods and uses described herein, the CpG-Ab immunoconjugate is administered to a subject in need thereof in an amount that is not effective for activating the complement system in the subject. In some embodiments, the CpG-containing immunostimulating polynucleotide is administered to a subject in need thereof in an amount that is not effective to activate complement C1 in the subject. In some embodiments, the CpG-containing immunostimulating polynucleotide is administered to a subject in need thereof in an amount that is not effective to activate complement C3 in the subject. Complement activation can be detected using methods known in the art. In some embodiments, the CpG-Ab immunoconjugate is administered to a subject in need thereof in an amount that is not effective for the antibody portion of the CpG-Ab immunoconjugate to induce antibody-dependent cell-mediated cytotoxicity in the subject.

As described herein, therapeutic agents, conjugates or compositions comprising the CpG-containing polynucleotides can be used in combination with at least one additional therapeutic agents for preventing or treating cancer. In some embodiments, such combination therapy exhibits a synergistic therapeutic effect that is better than the separate effect of either therapeutic agent alone. In some embodiments, such combination therapies exhibits a synergistic therapeutic effect that is better than the sum of the separate effects of the therapeutic agents alone.

Accordingly, in certain aspects, provided herein are methods for preventing or treating cancer using the CpG-containing immunostimulating polynucleotide in combination with at least one additional cancer therapeutic agent. Such methods comprising administering to a subject in need thereof (i) a therapeutically effective amount of the CpG-containing immunostimulating polynucleotide, and (ii) a therapeutically effective amount of at least one additional cancer therapeutic agents. In particular embodiments, the CpG-containing immunostimulating polynucleotide is administered as a free-standing polynucleotide. In particular embodiments, the CpG-containing immunostimulating polynucleotide is administered as a CpG-Ab immunoconjugate. In particular embodiments, the CpG-containing immunostimulating polynucleotide and the additional therapeutic agents are formulated in the same composition. In other embodiments, CpG-containing immunostimulating polynucleotide and the additional therapeutic agents are formulated in the separate compositions.

In some embodiments, the at least one additional cancer therapeutic agent is selected from T cell agonists, immune checkpoint modulators, STING agonists, RIG-I agonists, other toll-like receptor agonists.

In some embodiments, the additional cancer therapeutic agent is a T cell costimulatory molecule. In some embodiments, the T cell costimulatory molecule is selected from OX40, CD2, CD27, CDS, ICAM-1, LFA-1/CD11a/CD18, ICOS/CD278, 4-1 BB/CD137, GITR, CD30, CD40, BAFFR, HVEM, CD7, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3, and CD83, or a ligand thereof. In some embodiments, a ligand of a costimulatory molecule is an antibody specifically binding to the costimulatory molecule. In particular embodiments, the additional cancer therapeutic agent is selected from an anti-OX40 antibody, an anti-OX40L antibody, an anti-ICOS antibody, an anti-CTLA4 antibody, an anti-CD40L antibody, an anti-CD28 antibody, an anti-LFA1 antibody, an anti-TIM1/TIM3 antibody, an anti-PD1 antibody, an anti-PDL1 antibody, an anti-CD27 antibody and an anti-4-1 BB antibody.

In some embodiments, the additional cancer therapeutic agent is a tumor associated antigen produced by the cancer that is being prevented or treated with the method. In some embodiments, the cancer being prevented or treated is leukemia, lymphoma, melanoma, colorectal, breast, prostate, renal, pancreatic, head and neck, skin, and brain cancer, lung cancer, and the tumor associated antigen is selected from CD19, CD20, CD22, CD38, CD138, CD30, CD52, CD56, CD79, CD123, CD206, CD303, CD304, EGFR, folate receptor alpha, folate receptor beta, mesothelin, Her2, transferrin receptor, and PSMA. In some embodiments, the additional cancer therapeutic agent is an immune checkpoint modulator selected from inhibitors of PD-1, PD-L1, PD-L2, TIM-3, LAG-3, CEACAM-1, CEACAM-5, CLTA-4, VISTA, BTLA, TIGIT, LAIR1, CD47, CD160, 2B4, CD172a, and TGFR. In particular embodiments, the additional cancer therapeutic agent is an PD-1 inhibitor. In particular embodiments, the additional cancer therapeutic agent is an PD-L1 inhibitor. In particular embodiments, the additional cancer therapeutic agent is an CD47 inhibitor. In some embodiments, the additional cancer therapeutic agent is an antibody specifically binding to the immune checkpoint modulator. In some embodiments, In particular embodiments, the additional cancer therapeutic agent is an anti-PD-1 antibody or an antigen binding fragment thereof. In particular embodiments, the additional cancer therapeutic agent is an anti-PD-L1 antibody or an antigen binding fragment thereof. In particular embodiments, the additional cancer therapeutic agent is an anti-CD47 antibody or an antigen binding fragment thereof. In particular embodiments, the additional cancer therapeutic agent is an anti-CD172a antibody or an antigen binding fragment thereof, In particular embodiments, the additional cancer therapeutic agent is an anti-OX40 antibody or an antigen binding fragment thereof, In particular embodiments, the additional cancer therapeutic agent is an anti-TIM3 antibody or an antigen binding fragment thereof, In particular embodiments, the additional cancer therapeutic agent is an anti-LAG3 antibody or an antigen binding fragment thereof. Anti-PD-1 and anti-PD-L1 antibodies and their uses are described in, for example, US20180030137, U.S. Pat. No. 9,815,898, US20170313776, US20170313774, US20170267762, WO2017019846, WO2018013017, US20180022809, US20180002423, WO2017220990, WO2017218435, WO2017215590, U.S. Pat. No. 9,828,434, and WO2017196867. Anti-CD47 antibodies and their uses are described in, for example U.S. Pat. Nos. 9,663,575, 9,803,016, US20170283498, US20170369572, WO2017215585, WO2017196793, and WO2017049251.

In some embodiments, the additional cancer therapeutic agent is a STING pathway agonist. STING (stimulator of interferon genes, also known as TMEM173, MITA, ERIS, and MPYS) is a transmembrane protein localized to the ER that undergoes a conformational change in response to direct binding of cyclic dinucleotides (CDNs), resulting in a downstream signaling cascade involving TBK1 activation, IRF-3 phosphorylation, and production of IFN-β and other cytokines. The STING pathway in tumor-resident host antigen presenting cells is involved in the induction of a spontaneous CD8+ T cell response against tumor associated antigens. Activation of this pathway and the subsequent production of IFN-β also contributes to the anti-tumor effect. In some embodiments, the STING pathway agonist is ADU-S100. Additional STING agonists and their uses are described in, for example, US20180028553, US20170319680, US20170298139, US20060040887, US20080286296, US20120041057, US20140205653, WO2014179335, WO 2014179760, US20150056224, WO 2016096174, WO 2017011444, WO 2017027645, and WO 2017027646.

In some embodiments, the additional cancer therapeutic agent is a RIG-1 pathway agonist. RIG-1 (retinoic acid-inducible gene-I) is a member of pattern-recognition receptors that initiates a host's innate immune system to defend against pathogenic microbes in early phases of infection. There are three members of the (RIG-I)-like receptors family: RIG-I, MDA5 (melanoma differentiation factor 5), and LGP2 (laboratory of genetics and physiology 2), which are expressed in most cell and tissue types. RIG-1 functions as a cytoplasmic sensor for the recognition of a variety of RNA viruses and subsequent activation of downstream signaling to drive type I IFN production and antiviral gene expressions. Activated RIG-1 recruits its downstream adaptor molecule MAVS (also known as IPS-1, CARDIF, and VISA) through CARD-CARD-mediated interactions. The oligomeric RIG-1 CARD assembly and the polymeric formation of MAVS, together serve as a signaling platform for protein complexes that mediate the bifurcation of signaling into two branches. One branch recruits tumor necrosis factor receptor-associated factors (TRAF)-2/6 and the receptor-interacting protein 1 to subsequently activate the IKK complex, resulting in NF-κB activation. The other branch signals through TRAF3 and activates the TANK/IKKγ/IKKε/TBK1 complex, leading to the phosphorylation and dimerization of interferon regulator factors (IRF)-3 and -7. Liu et al., Front Immunol. 2017, 7:662. Activation of this pathway contributes to the anti-tumor effect. In some embodiments, the RIG-I pathway agonist is RGT100. RIG-I agonists and their uses are described in, for example, US20170057978, US20170258897, U.S. Pat. Nos. 9,381,208, 9,738,680, 9,650,427, WO2017173427, and WO2017011622.

In some embodiments, the additional cancer therapeutic agent is a toll-like receptor agonist selected from TLR1 agonist, TLR2 agonist, TLR3 agonist, TLR4 agonist, TLR5 agonist, TLR6 agonist, TLR7 agonist, TLR8 agonist, and TLR10 agonist.

In further embodiments, in relation to a method of treating cancer, the CpG-containing immunostimulating polynucleotide is administered (either in the free-standing form or as a CpG-Ab immunoconjugate) in combination with one or more additional therapeutic agents or procedures, for example wherein the additional therapeutic agent or procedure is selected from the group consisting of chemotherapy, a targeted anti-cancer therapy, an oncolytic drug, a cytotoxic agent, an immune-based therapy, a cytokine, surgical procedure, a radiation procedure, an activator of a costimulatory molecule, an inhibitor of an inhibitory molecule, a vaccine, a cellular immunotherapy, and an oncolytic virus therapy.

As provided herein, the CpG-containing polynucleotide (either in a free-standing form or as a CpG-Ab conjugate) may be administered, for example, by non-parenteral or parenteral administration. Parenteral administration may include intramuscular, intravenous, intraarterial, intracranial, subcutaneous, intraorbital, intraventricular, intraspinal, intrathecal, intraperitoneal, rectal, and topical routes of administration. Topical route of administration may include transdermal, intradermal, buccal, and sublingual routes of administration. The pharmaceutical compositions are formulated according to the selected route of administration. Parenteral administration may be by continuous infusion over a selected period of time. In particular embodiments, the administration is subcutaneous, intramuscular, intradermal, mucosal, vaginal, cervical, peri-tumoral, intra-tumoral, or directly into the tumor-draining lymph node(s). The polynucleotides and/or conjugates desirably are administered with a pharmaceutically acceptable carrier. Pharmaceutical formulations of the polynucleotides and/or conjugates described herein formulated for treatment of the disorders described herein are also part of the present invention.

The actual dosage amount of the CpG-containing immunostimulating polynucleotide (either in a free-standing form or as a CpG-Ab conjugate) administered to a subject can be determined by physical and physiological factors such as body weight, severity of condition, the type of disease being treated, previous or concurrent therapeutic interventions, idiopathy of the patient and on the route of administration. The actual dosage amount of the CpG-containing immunostimulating polynucleotide (either in a free-standing form or as a CpG-Ab conjugate) can be administered in a single dose or in a series of sequential doses. Depending upon the dosage and the route of administration, the number of administrations of a preferred dosage and/or an effective amount may vary according to the response of the subject. The practitioner responsible for administration will, in any event, determine the concentration of active ingredient(s) in a composition, appropriate dose(s) and schedule(s) for the individual subject.

In certain embodiments, the CpG-containing immunostimulating polynucleotide is administered in a free-standing form at a dosage that ranges from 0.01 milligram/kg body weight to 1000 milligram/kg body weight, including the end points. In other non-limiting examples, a dose may also comprise from about 0.01 milligram/kg bodyweight to about 0.05 milligram/kg bodyweight. In other non-limiting examples, a dose may also comprise from about 0.01 milligram/kg bodyweight, about 0.05 milligram/kg bodyweight, about 0.1 milligram/kg bodyweight, about 0.2 milligram/kg bodyweight, about 0.3 milligram/kg bodyweight, about 0.4 milligram/kg bodyweight, about 0.5 milligram/kg bodyweight, about 0.6 milligram/kg bodyweight, about 0.7 milligram/kg bodyweight, about 0.8 milligram/kg bodyweight, about 0.9 milligram/kg bodyweight, about 1 milligram/kg bodyweight, about 2 milligram/kg bodyweight, about 3 milligram/kg bodyweight, about 4 milligram/kg bodyweight, about 5 milligram/kg bodyweight, about 6 milligram/kg bodyweight, about 7 milligram/kg bodyweight, about 8 milligram/kg bodyweight, about 9 milligram/kg bodyweight, about 10 milligram/kg bodyweight, about 20 milligram/kg bodyweight, about 30 milligram/kg bodyweight, about 40 milligram/kg bodyweight, about 50 milligram/kg bodyweight, about 60 milligram/kg bodyweight, about 70 milligram/kg bodyweight, about 80 milligram/kg bodyweight, about 90 milligram/kg bodyweight, about 100 milligram/kg bodyweight, about 200 milligram/kg bodyweight, about 300 milligram/kg bodyweight, about 400 milligram/kg bodyweight, about 500 milligram/kg bodyweight, about 600 milligram/kg bodyweight, about 700 milligram/kg bodyweight, about 800 milligram/kg bodyweight, about 900 milligram/kg bodyweight, about 1000 milligram/kg bodyweight, or more per administration, and any range derivable therein.

In certain embodiments, the CpG-Ab immunoconjugate is administered at a dosage that ranges from about 1 microgram/kg body weight to about 500 milligram/kg body weight, including the end points. In other non-limiting examples, a dose may also comprise from about 1 microgram kg body weight, about 5 microgram/kg body weight, about 10 microgram/kg body weight, about 50 microgram/kg body weight, about 100 microgram/kg body weight, about 200 microgram/kg body weight, about 350 microgram/kg body weight, about 500 microgram/kg body weight, about 1 milligram/kg body weight, about 5 milligram/kg body weight, about 10 milligram/kg body weight, about 50 milligram/kg body weight, about 100 milligram/kg body weight, about 200 milligram/kg body weight, about 350 milligram/kg body weight, about 500 milligram/kg body weight, about 1000 mg/kg body weight or more per administration, and any range derivable therein. In non-limiting examples of a derivable range from the numbers listed herein, a range of about 5 mg/kg/body weight to about 100 mg/kg/body weight, about 5 microgram/kg/body weight to about 500 milligram/kg/body weight, etc., can be administered, based on the numbers described above.

In particular embodiments, the CpG-Ab conjugate is administered in three sequential doses, each dose of about 3 milligram/kg/body weight per administration. In particular embodiments, the CpG-Ab conjugate is administered in three sequential doses, each dose of about 10 milligram/kg/body weight per administration. In particular embodiments, the sequential doses are performed at 48-hour intervals.

As provided herein, the combination therapy involves the administration of two or more therapeutic agents. Such administration encompasses co-administration of these therapeutic agents in a substantially simultaneous manner, such as in a single formulation having a fixed ratio of active ingredients or in separate formulations (e.g., capsules and/or intravenous formulations) for each therapeutic agent. In addition, such administration also encompasses administration of each type of therapeutic agent simultaneously or sequentially. Such administration also encompasses each component being formulated as a separate formulation that can be administered at different locations or through different administration routes (e.g., intratumorally and/or systemically). In any case, the treatment regimen of the combination therapy can be determined by the responsible practitioner to provide beneficial effects in treating the conditions or disorders described herein.

In certain embodiments, the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate is administered at about the same time as administration of the at least one additional cancer therapeutic agent. As non-limiting examples, administration of the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate and the at least one additional cancer therapeutic agent can be simultaneous, such as within 30 minutes of one another, within 25 minutes of one another, within 20 minutes of one another, within 15 minutes of one another, within 10 minutes of one another, within 5 minutes of one another, or within 1 minute of one another.

In certain embodiments, the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate is administered sequentially with the at least one additional cancer therapeutic agent. In some embodiments, the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate is administered prior to the administration of the at least one additional cancer therapeutic agent. In some embodiments, the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate is administered after the administration of the at least one additional cancer therapeutic agent. As non-limiting examples, administration of the CpG-containing immunostimulating polynucleotide or CpG-Ab immunoconjugate and the at least one additional cancer therapeutic agent can be separated for at least 30 minutes from one another, at least 1 hour from one another, at least 6 hours from one another, at least 12 hours from one another, at least 24 hours from one another, at least 36 hours from one another, at least 48 hours from one another, at least 3 days from one another, at least 1 week from one another, at least 2 weeks from one another, or at least 1 month from one another.

In certain embodiments, the CpG-containing immunostimulating polynucleotide is administered prior to administration of the immune checkpoint modulator. In such methods, the immune checkpoint modulator can be administered within 48 hours of administration of the CpG-containing immunostimulating polynucleotide, such as within at least or at least about or about or 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 6 hours, 8 hours, 12 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, 30 hours, 36 hours, 40 hours or 48 hours of administration of the CpG-containing immunostimulating polynucleotide. In some methods and uses, the CpG-containing immunostimulating polynucleotide is administered 6 hours to 30 hours or 12 hours to 24 hours, each inclusive, prior to administration of the immune checkpoint modulator. In certain embodiments, the immune checkpoint modulator can be administered within 3 days, 4 days, 5 days, 7 days, 2 weeks, 3 weeks, or 4 weeks of administration of the CpG-containing immunostimulating polynucleotide. The timing and order of administration can be empirically determined, if necessary, for particular immune checkpoint modulators. In these embodiments, the CpG-containing immunostimulating polynucleotide can be administered either in the free-standing form or as a CpG-Ab immunoconjugate.

In certain embodiments, both the CpG-containing immunostimulating polynucleotide and the immune checkpoint modulator are administered through a series of sequential doses. In particular embodiments, the first dose of the CpG-containing immunostimulating polynucleotide and the first dose of the immune checkpoint modulator are administered simultaneously, and the subsequent dose(s) of the CpG-containing immunostimulating polynucleotide and subsequent dose(s) of the immune checkpoint modulator are administered sequentially. In these embodiments, the CpG-containing immunostimulating polynucleotide can be administered either in the free-standing form or as a CpG-Ab immunoconjugate.

In certain embodiments, the CpG-containing immunostimulating polynucleotide is administered prior to administration of a T cell agonist. In such methods, the T cell agonist can be administered within 48 hours of administration of the CpG-containing immunostimulating polynucleotide, such as within at least or at least about or about or 5 minutes, 15 minutes, 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 6 hours, 8 hours, 12 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, 30 hours, 36 hours, 40 hours or 48 hours of administration of the CpG-containing immunostimulating polynucleotide. In some methods and uses, the CpG-containing immunostimulating polynucleotide is administered 6 hours to 30 hours or 12 hours to 24 hours, each inclusive, prior to administration of the T cell agonist. In certain embodiments, the T cell agonist can be administered within 3 days, 4 days, 5 days, 7 days, 2 weeks, 3 weeks, or 4 weeks of administration of the CpG-containing immunostimulating polynucleotide. The timing and order of administration can be empirically determined, if necessary, for particular T cell agonists. In these embodiments, the CpG-containing immunostimulating polynucleotide can be administered either in the free-standing form or as a CpG-Ab immunoconjugate.

In certain embodiments, both the CpG-containing immunostimulating polynucleotide and the T cell agonist are administered through a series of sequential doses. In particular embodiments, the first dose of the CpG-containing immunostimulating polynucleotide and the first dose of the T cell agonist are administered simultaneously, and the subsequent dose(s) of the CpG-containing immunostimulating polynucleotide and the subsequent dose(s) of the T cell agonist are administered sequentially. In these embodiments, the CpG-containing immunostimulating polynucleotide can be administered either in the free-standing form or as a CpG-Ab immunoconjugate.

Treatment of Autoimmune Diseases

Antagonizing TLR9 can help reducing the secretion of pro-inflammatory cytokines. Accordingly, immunosuppressive polynucleotides of the invention and their conjugates may be useful in the treatment of diseases characterized by the overexpression of pro-inflammatory cytokines (e.g., autoimmune diseases). Non-limiting examples of autoimmune disease are: psoriasis, rheumatoid arthritis, lupus, Guillain-Barre syndrome, vasculitis, myasthenia gravis, ankylosing spondylitis, hemolytic anemia, polyarteritis nodosa, idiopathic thrombocytopenic purpura, antiphospholipid antibody syndrome, primary biliary cirrhosis, Crohn's disease, ulcerative colitis, autoimmune hepatitis, scleroderma, dermatomyositis, and alopecia areata.

Pharmaceutical Compositions

Delivery of an immunomodulating polynucleotide can be achieved by contacting a cell with the immunomodulating polynucleotide or the conjugate using a variety of methods known to those of skill in the art. In particular embodiments, the immunomodulating polynucleotide or the conjugate of the invention may be formulated as a pharmaceutical composition including a pharmaceutically acceptable excipient and/or a pharmaceutically acceptable carrier. The pharmaceutical composition can be in a liquid or solid (e.g., lyophilized) form.

For human use, the immunomodulating polynucleotide or the conjugate of the invention can be administered alone or in admixture with a pharmaceutical carrier selected with regard to the intended route of administration and standard pharmaceutical practice. Pharmaceutical compositions for use in accordance with the present invention thus can be formulated in a conventional manner using one or more physiologically acceptable carriers, excipients, and auxiliaries that facilitate processing the conjugate of the invention into preparations which can be used pharmaceutically.

Frequently used carriers or excipients include sugars (e.g., lactose, mannitol), milk protein, gelatin, starch, vitamins, cellulose and its derivatives, poly(ethylene glycol)s and solvents, such as sterile water, alcohols, glycerol, and polyhydric alcohols. Intravenous vehicles can include fluid and nutrient replenishers. Other pharmaceutically acceptable carriers include aqueous solutions, non-toxic excipients, including salts, preservatives, buffers and the like, as described, for instance, in Remington: The Science and Practice of Pharmacy, 21^(st) Ed., Gennaro, Ed., Lippencott Williams & Wilkins (2005), and The United States Pharmacopeia: The National Formulary (USP 36 NF31), published in 2013. The pH and exact concentration of the various components of the pharmaceutical composition can be adjusted in accordance with routine practices in the art. See Goodman and Gilman's, the Pharmacological Basis for Therapeutics.

In making the pharmaceutical compositions of the invention, the active ingredient is typically mixed with an excipient (e.g., in lyophilized formulations) or diluted by an excipient. When the excipient serves as a diluent, it can be a solid, semisolid, or liquid material (e.g., phosphate-buffered saline), which acts as a vehicle, carrier, or medium for the active ingredient. Thus, the compositions can be in the form of tablets, powders, elixirs, suspensions, emulsions, solutions, and syrups. As is known in the art, the type of diluent can vary depending upon the intended route of administration. The resulting compositions can include additional agents, e.g., preservatives. The formulations can additionally include: lubricating agents, e.g., talc, magnesium stearate, and mineral oil; wetting agents; emulsifying and suspending agents; preserving agents, e.g., methyl- and propylhydroxy-benzoates; sweetening agents; and flavoring agents. Other exemplary excipients are described in Handbook of Pharmaceutical Excipients, 6^(th) Edition, Rowe et al., Eds., Pharmaceutical Press (2009). Preservatives can include antimicrobial agents, anti-oxidants, chelating agents, and inert gases.

These pharmaceutical compositions can be manufactured in a conventional manner, e.g., by conventional mixing, dissolving, granulating, dragee-making, levigating, emulsifying, encapsulating, entrapping, or lyophilizing processes. Methods well known in the art for making formulations are found, for example, in Remington: The Science and Practice of Pharmacy, 21^(st) Ed., Gennaro, Ed., Lippencott Williams & Wilkins (2005), and Encyclopedia of Pharmaceutical Technology, eds. J. Swarbrick and J. C. Boylan, 1988-1999, Marcel Dekker, New York. Proper formulation is dependent upon the route of administration chosen. The formulation and preparation of such compositions is well-known to those skilled in the art of pharmaceutical formulation. In preparing a formulation, a polynucleotide or conjugate can be milled to provide the appropriate particle size prior to combining with the other ingredients.

Route of Administration

The pharmaceutical compositions of the invention may be administered locally or systemically. The therapeutically effective amounts will vary according to factors, such as the extent of the diseases progression in a subject, the age, sex, and weight of the individual. Dosage regimens can be adjusted to provide the optimum therapeutic response. For example, several divided doses can be administered daily or the dose can be proportionally reduced as indicated by the exigencies of the therapeutic situation.

The pharmaceutical compositions of the invention may be administered to a patient in a variety of forms depending on the selected route of administration, as will be understood by those skilled in the art. The polynucleotides and/or conjugates used in the methods described herein may be administered, for example, by parenteral administration. Parenteral administration may include intramuscular, intravenous, intraarterial, intracranial, subcutaneous, intraorbital, intraventricular, intraspinal, intrathecal, intraperitoneal, rectal, and topical routes of administration. Topical route of administration may include transdermal, intradermal, buccal, and sublingual routes of administration. The pharmaceutical compositions are formulated according to the selected route of administration. Parenteral administration may be by continuous infusion over a selected period of time. The polynucleotides and/or conjugates desirably are administered with a pharmaceutically acceptable carrier. Pharmaceutical formulations of the polynucleotides and/or conjugates described herein formulated for treatment of the disorders described herein are also part of the present invention.

Formulations for Parenteral Administration

An immunomodulating (e.g., immunostimulating) polynucleotide and/or conjugate of the invention described herein can be administered to a patient in need thereof in a pharmaceutically acceptable parenteral (e.g., intravenous, intramuscular, or subcutaneous) formulation as described herein. The pharmaceutical formulation may also be administered parenterally (e.g., intravenously, intramuscularly, or subcutaneously) in dosage forms or formulations containing conventional, non-toxic pharmaceutically acceptable carriers and adjuvants. In particular, formulations suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation isotonic with the blood of the patient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents. For example, to prepare such a composition, an immunomodulating polynucleotide or conjugate of the invention may be dissolved or suspended in a parenterally acceptable liquid vehicle. Among acceptable vehicles and solvents that may be employed are water, water adjusted to a suitable pH by addition of an appropriate amount of hydrochloric acid, sodium hydroxide or a suitable buffer (e.g., phosphate buffered saline), 1,3-butanediol, Ringer's solution and isotonic sodium chloride solution. The aqueous formulation may also contain one or more preservatives, for example, methyl, ethyl or n-propyl p-hydroxybenzoate. Additional information regarding parenteral formulations can be found, for example, in the United States Pharmacopeia-National Formulary (USP-NF), herein incorporated by reference.

The parenteral formulation of the conjugate of the invention can be any one of the four general types of preparations identified by the USP-NF as suitable for parenteral administration:

-   -   (1) “Drug for Injection”: the drug substance (e.g., the         conjugate of the invention) as a dry (e.g., lyophilized) solid         that will be combined with the appropriate sterile vehicle for         parenteral administration as a drug injection;     -   (2) “Drug Injectable Emulsion”: a liquid preparation of the drug         substance (e.g., the conjugate of the invention) that is         dissolved or dispersed in a suitable emulsion medium;     -   (3) “Drug Injectable Suspension”: a liquid preparation of the         drug substance (e.g., the conjugate of the invention) suspended         in a suitable liquid medium; and     -   (4) “Drug for Injectable Suspension”: the drug substance (e.g         the conjugate of the invention) as a dry solid that will be         combined with the appropriate sterile vehicle for parenteral         administration as a drug injectable suspension.

Exemplary formulations for parenteral administration include solutions of the polynucleotides and/or conjugates prepared in water suitably mixed with a surfactant, e.g., hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid poly(ethylene glycol)s, DMSO and mixtures thereof with or without alcohol, and in oils. Under ordinary conditions of storage and use, these preparations may contain a preservative to prevent the growth of microorganisms. Conventional procedures and ingredients for the selection and preparation of suitable formulations are described, for example, in Remington: The Science and Practice of Pharmacy, 21^(st) Ed., Gennaro, Ed., Lippencott Williams & Wilkins (2005) and in The United States Pharmacopeia: The National Formulary (USP 36 NF31), published in 2013.

Biocompatible, biodegradable lactide polymer, lactide/glycolide copolymer, or polyoxyethylene-polyoxypropylene copolymers may be used to control the release of the polynucleotide and/or conjugate. Other potentially useful parenteral delivery systems for polynucleotides and/or conjugates include ethylene-vinyl acetate copolymer particles, osmotic pumps or implantable infusion systems. The parenteral formulation can be formulated for prompt release or for sustained/extended release of the polynucleotides and/or conjugates. Exemplary formulations for parenteral release of a polynucleotide or conjugate include: aqueous solutions, powders for reconstitution, cosolvent solutions, oil/water emulsions, suspensions, microspheres, and polymeric gels.

The following examples are meant to illustrate the invention. They are not meant to limit the invention in any way.

EXAMPLES Example 1. Synthesis and Purification of the Nucleotides and Polynucleotides

Exemplary syntheses of immunomodulating polynucleotides and precursors therefor are described below.

Precursors

Precursors useful in the preparation of the polynucleotides of the invention are provided in WO 2015/188197 (e.g., phosphoramidites, targeting moieties, and bioreversible groups containing PEG chains).

Phosphoramidites and Other Monomers

Nucleoside-containing intermediates useful in the synthesis of polynucleotides of the invention are disclosed in WO 2015/188197 (e.g., compounds U1-U54, A1-A15, C1-9, and G1-G12 in WO 2015/188197).

Commercially available phosphoramidites were purchased from Glen Research (Sterling, Va.) or ChemGenes (Wilmington, Mass.). When required, other phosphoramidtes were prepared from appropriately protected nucleosides using standard reaction conditions described here are elsewhere. Compound S61B

To a solution of S61 (0.48 g, 2.0 mmol) in DCM (5.0 mL) were added S61A (0.60 g, 2.0 mmol) and ETT (0.25 M in acetonitrile, 4.8 mL, 1.2 mmol). The mixture was stirred for 2 h. Evaporation of the volatiles afforded a residue, which was subjected to flash silica gel column purification using ethylacete/hexane (0-30% gradient on Combi Flash Rf instrument) to give compound S61 B as colorless oil (0.49 g, 55%). ³¹P NMR (202 MHz, CDCl₃; ppm): δ147.83 (s).

Compound S108

To a stirring mixture of 2-[2-(2-aminoethoxy)ethoxy]ethanol (S108A, 25.0 g, 167 mmol) and N-methyl morpholine (21.0 mL, 191 mmol) in dioxane (100 mL) was added dropwise a solution of Fmoc-OSu (62.2 g, 184 mmol) in dioxane (50 mL). After stirring overnight, the reaction was concentrated in vacuo to afford a light yellow oil. The crude was re-dissolved in EtOAc and washed with sat. NaHCO₃ (aq.) and brine. The organic layer was removed in vacuo to afford an oil, which was purified by SiO₂ chromatography to provide the FmocNH-PEG2-OH (S108, 55 g, 88% yield). ESI+ m/z calcd 371.4, found 372.2 [M+H]⁺.

X1 and X2 Abasic Spacer Synthesis—General Scheme:

Compound S110

To a suspension of NaH (13.2 g, 60% in mineral oil, 230.0 mmol) in THE (40 mL) under argon at 0° C. was added a solution of diol (S109, 4.92 g, 22.0 mmol) in THE (20 mL) dropwise; the resulting mixture was warmed to room temperature and stirred for 1 h. The reaction mixture was cooled to 0° C., a solution of propargyl bromide (18.6 g, 158.4 mmol) in THE (25 mL) was added slowly, and the resulting mixture was warmed to room temperature and stirred overnight at 40° C. After the product was consumed, as observed by TLC, the reaction was quenched by dropwise addition of water at 0° C., and the resulting mixture was extracted with dichloromethane (50 mL×2). The combined organic layers were washed with brine and dried over anhydrous Na₂SO₄, filtered, and evaporated to give a residue, which was purified by flash silica gel column using ISCO companion (hexane/ethyl acetate, 0-30%) to give 5.92 g (89.5%) of compound S110 as an oil. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.49-7.47 (dd, J 8.0, 1.5 Hz, 2H), 7.38-7.34 (m, 3H), 5.43 (s, 1H), 4.21 (d, J 2.5 Hz, 2H), 4.12 (t, J 2.5 Hz, 4H), 4.10 (s, 1H), 3.91 (s, 1H), 3.89 (s, 1H), 3.37 (s, 2H); ESI MS for C₁₈H₂₀O₄ calculated 300.34, observed [M+H]⁺ 301.3.

Compound S111

Bis-propargyl compound S110 (5.9 g, 19.64 mmol) was dissolved in acetic acid/water mixture (60 mL, 75:25), and the reaction was continued at 50° C. for 2 h. After completion of the reaction, the solution was evaporated and co-evaporated with toluene (2×20 mL). The residue was purified directly without any workup using the flash silica gel column using ISCO companion (hexane/ethyl acetate, 20-80%) to give 3.02 g (72.5%) of the compound S111 as an oil. ¹H NMR (500 MHz, CDCl₃, ppm): δ4.15 (d, J 2.5 Hz, 4H), 3.68 (s, 4H), 3.59 (s, 4H), 2.44 (t, J 2.5 Hz, 2H), 2.30-2.40 (br, 2H); ESI MS for C₁₁H₁₆O₄ calculated 212.24, observed [M+H]⁺ 213.2.

Compound S112

To a solution of diol S111 (3.0 g, 14.2 mmol), N,N-diisopropylethylamine (3.15 mL, 17.0 mmol), and DMAP (0.36 g, 2.83 mmol) in dichloromethane (25 mL) at 0° C. was added dropwise a solution of dimethoxytrityl chloride (4.8 g, 14.2 mmol) in dichloromethane (40 mL), and the reaction continued at room temperature overnight. The mixture was diluted with dichloromethane and washed with water followed by brine, and the organic layers were dried over anhydrous Na₂SO₄, filtered, and evaporated. The resulting residue was purified by flash silica gel column using ISCO companion (hexane/ethyl acetate, 0-40%) to give 5.29 g (73%) of the mono DMT protected compound S112 as white solid. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.4-7.42 (m, 2H), 7.32-7.31 (m, 4H), 7.28-7.25 (m, 2H), 6.84-6.81 (m, 4H), 4.09 (d, J 2.5 Hz, 4H), 3.79 (s, 6H), 3.67 (d, J 6.0 Hz, 2H), 3.64-3.56 (m, 4H), 3.13 (s, 2H), 2.39 (t, J 2.5 Hz, 2H); ESI MS for C₃₂H₃₄O₆ calculated 514.6, observed [M+Na]⁺ 537.4,

Compound S113

To a solution of DMT-protected compound S112 (0.5 g, 0.98 mmol) in dichloromethane (4 mL) was added dropwise a solution of 2′-cyanoethyl-N,N,N′,N′-tetraisopropyl phosphoramidite (0.58 g, 1.95 mmol) in dichloromethane (3 mL) at room temperature followed by 5-benzylthio-1H-tetrazole (BTT; 0.25 M solution in acetonitrile, 0.78 mL, 0.18 mmol) under argon atmosphere. The reaction was continued until the starting material disappeared (2 h), and the crude mixture was diluted with 20 mL of dichloromethane, washed sequentially with saturated NaHCO₃ solution (10 mL) and brine (10 mL), and dried over anhydrous Na₂SO₄. The solvent was evaporated in vacuo, and the crude mixture was purified by silica gel column chromatography using ethyl acetate/hexane having 3% triethylamine as a co-solvent (0-30% gradient on Combi Flash Rf Instrument) to give 0.53 g of compound S113 (75%) as an oil. ESI MS for C₄₁H₅₁N₂O₇P Calculated 714.82, Observed 715.6 [M+H]⁺; ³¹P NMR (202 MHz, CDCl₃): δ 147.89.

Compound S114

To a −78° C. solution of DMT-protected compound S112 (0.98 g, 1.9 mmol) and N,N-diisopropylethylamine (0.39 mL, 2.09 mmol) in 8.0 mL of dry dichloromethane under argon atmosphere was added dropwise a dichloromethane (4.0 mL) solution of bis-(N,N-diisopropylamino)-chlorophosphine (0.56 g, 2.09 mmol). The reaction mixture was allowed to warm to room temperature while stirring was maintained for 1 h. A solution of 3-butyne-1-ol (0.14 g, 1.9 mmol) in 2.0 mL of dry dichloromethane was added at room temperature; the resulting mixture was stirred for 10 minutes, at which time a 0.25M solution of ETT in acetonitrile (4.6 mL, 1.15 mmol) was added, and stirring continued for an additional 3 h. After completion of the reaction, as observed by the disappearance of the starting material by TLC, the crude mixture was diluted with 20 mL of dichloromethane and washed sequentially with saturated NaHCO₃ solution (10 mL) and brine (10 mL) and dried over anhydrous Na₂SO₄. The volatiles were evaporated in vacuo, and the crude mixture was purified by silica gel column chromatography using ethyl acetate/hexane with 3% triethylamine as solvent system (0-40% gradient on Combi Flash Rf Instrument) to give 0.33 g of compound S114 (25%) as an oil. ESI MS for C₄₂H₅₂NO₇P Calculated 713.83, Observed 714.7 [M+H]⁺; ³¹P NMR (202 MHz, CDCl₃): δ146.89.

X3 and X4 Abasic Spacer Synthesis—General Scheme:

Compound S116

Compound S116 was prepared using the protocol described for compound S110 in 91% yield as oil. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.51 (d, J 7.5 Hz, 2H), 7.37-7.32 (m, 3H), 5.56 (s, 1H), 3.37-3.35 (m, 4H), 4.10-4.07 (dd, J 13.0 Hz, J 2.5 Hz, 2H), 3.65-3.64 (m, 1H), 2.43-2.42 (t, J 6.5 Hz, 1H); ESI MS for C₁₃H₄O₃ calculated 218.24, observed [M+H]⁺ 219.2.

Compound S117

Compound S117 was prepared using the protocol described for compound S111 in 91% yield as oil. ¹H NMR (500 MHz, CDCl₃, ppm): δ4.33 (s, 2H), 3.83-3.70 (m, 5H), 2.48 (s, 1H), 2.04 (br, 2H); ESI MS for C₆H₁₀O₃ calculated 130.14, observed [M+Na]⁺ 153.0.

Compound S118

Compound S118 was prepared using the protocol described for compound S112 in 54% yield as a white solid. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.43 (d, J 7.5 Hz, 2H), 7.37-7.27 (m, 5H), 7.23-7.16 (m, 2H), 6.83 (d, J 9.0 Hz, 3H), 6.78-6.76 (dd J 8.5 Hz, 1H), 4.35-4.22 (m, 2H), 3.77 (s, 6H) 3.76-3.72 (m, 2H), 3.71-3.64 (m, 1H), 3.27-3.19 (m, 2H), 2.48 (t, J 4.5 Hz, 1H), 2.03-1.96 (m, 1H); ESI MS for C₂₇H₂₈O₅ calculated 432.50, observed [M+Na]⁺ 455.4.

Compound S119

Compound S119 was prepared using the protocol described for compound S113 in 86% yield as oil. ESI MS for C₃₆H₄₅N₂O₆P Calculated 432.72, Observed 433.5 [M+H]⁺; ³¹P NMR (202 MHz, CDCl₃): δ149.05, 148.96.

Compound S120

Compound S120 was prepared using the protocol described for compound S114 in 47% yield as oil. ESI MS for C₃₇H₄₆NO₆P Calculated 431.73, Observed 432.5 [M+H]⁺; ³¹P NMR (202 MHz, CDCl₃): δ147.80, 147.71.

X5 and X6 Abasic Spacer Synthesis—General Scheme:

Compound S121

To a solution of S116 (4.0 g, 22.2 mmol) in dioxane (25 mL) was added a solution of KOH (0.12 g, 2.2 mmol) dissolved in minimum amount of water, and the resulting mixture was stirred for at least 30 minutes at room temperature. The mixture was cooled to 0° C., a solution of acrylonitrile (2.35 g, 44.4 mmol) in dioxane (15 mL) was added dropwise, and the resulting mixture was allowed to react at room temperature for overnight. Volatiles were evaporated in vacuo, the residue was diluted with water, and the pH was adjusted to near neutral. The crude product was extracted with ethyl acetate (2×50 mL), and the combined organic layers were washed with brine and dried over anhydrous Na₂SO₄, filtered, and evaporated to give a residue, which was purified by flash silica gel column using ISCO companion (dichloromethane/methanol, 0-5%) to give 3.1 g (60%) of the compound S121 as white solid. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.49 (d, J 7.0 Hz, 2H), 7.36-7.34 (m, 3H), 5.56 (s, 1H), 3.36 (d, J 13.0 Hz 2H), 4.10-4.07 (dd, J 13.0 Hz, J 2.0 Hz, 2H), 3.84 (t, J 6.5 Hz, 2H), 3.42 (m, 1H), 3.69 (t, J 6.5 Hz, 2H); ESI MS for C₁₃H₁₅NO₃ calculated 233.2, observed [M+Na]⁺ 256.3.

Compound S122

To a suspension of lithium aluminum hydride (0.83 g, 4.0 mmol) in THE (10 mL) at 0° C. was added dropwise a solution of compound S121 (1.28 g, 5.5 mmol) in THE (15 mL), the resulting mixture was warmed to room temperature, and stirring was continued for 3 h. After completion of the reaction, the reaction mixture was cooled to 0° C. and quenched by dropwise addition of water as required (ca. 2-3 mL). Additional ca. 8 mL of water were added, and the crude product was extracted into ethyl acetate (2×25 mL). The combined organic layers were washed with brine, dried over anhydrous Na₂SO₄, filtered, and evaporated to give compound S122, which was used in the subsequent step without further purification. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.49 (d, J 7.0 Hz, 2H), 7.40-7.32 (m, 3H), 5.55 (d, J 5.0 Hz, 1H), 4.34 (d, J 13.0 Hz, 1H), 4.20-4.11 (dd, J 12.0 Hz 4H), 4.05-4.03 (d, J 13.0 Hz, J 2.0 Hz, 1H), 3.66-3.62 (m, 2H), 3.27 (m, 1H), 2.86 (t, J 6.5 Hz, 1H), 2.16 (br, 2H); ESI MS for C₁₃H₁₉NO₃ calculated 237.2, observed [M+H]⁺ 238.2.

Compound S123

To compound S122 (1.0 g, 4.2 mmol) and N,N-diisopropylethylamine (2.3 mL, 12.6 mmol) in dichloromethane (8 mL) at 0° C. was added dropwise a solution of Fmoc-OSu (1.7 g, 5.0 mmol), and the resulting mixture was allowed to react at room temperature for 3 h. After completion, the reaction mixture was diluted with dichloromethane (10 mL) and washed with water followed by brine. The organic layer was separated, dried over anhydrous Na₂SO₄, filtered, and evaporated to give a residue. The residue was purified by flash silica gel column using ISCO companion (hexane/ethyl acetate, 0-50%) to give 0.65 g (35%) of the compound S123 as a white solid. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.75 (d, J 7.5 Hz, 2H), 7.58 (d, J 7.5 Hz, 2H), 7.51 (d, J 7.5 Hz, 2H), 7.37 (t, J 7.5 Hz, 2H), 7.31-7.26 (m, 5H), 5.57 (s, 1H), 5.48 (br, 1H), 4.46-4.32 (m, 4H), 4.15 (d, J 7.0 Hz, 1H), 4.06 (t, J 12.5 Hz 2H), 3.67 (m, 2H), 3.54 (m, 2H), 3.41 (s, 1H), 1.88 (t, J 6.0 Hz, 2H); ESI MS for C₂₈H₂₉NO₅ calculated 459.5, observed [M+Na]⁺ 482.5.

Compound S124

Compound S124 was prepared using the protocol described for compound S111 with quantitative yields as an oil. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.76 (d, J 7.5 Hz, 2H), 7.58 (d, J 7.5 Hz, 2H), 7.39 (t, J 7.5 Hz, 2H), 7.32 (t, J 7.5 Hz, 2H), 5.18 (br, 1H), 4.44 (d, J 6.5 Hz, 2H), 4.21 (t, J 6.5 Hz, 1H), 4.76-4.73 (dd, J 11.5, 3.5 Hz 2H), 3.67-60 (m, 4H), 3.42 (m, 1H), 3.37 (br, 2H), 2.07 (m, 2H), 1.75 (br, 2H); ESI MS for C₂₁H₂₅NO₅ calculated 371.4, observed [M+Na]⁺ 394.3.

Compound S125

Compound S125 was prepared using the protocol described for compound S112 with 48% of product (S125) yield as a white solid. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.75 (t, J 7.5 Hz, 2H), 7.58 (t, J 7.5 Hz, 2H), 7.40-7.38 (m, 3H), 7.32-27 (m, 7H), 7.18-7.16 (m, 3H), 6.83 (t, J 7.0 Hz, 4H), 5.16 (br, 1H), 4.44 (d, J 6.5 Hz, 2H), 4.20 (m, 1H), 3.80 (s, 3H), 3.79 (m, 1H), 3.76 (s, 3H), 3.74 (m, 2H), 3.66-3.62 (m, 4H), 3.43-3.37 (m, 2H), 2.31 (br, 1H), 1.76 (br, 2H); ESI MS for C₄₂H₄₃NO₇ calculated 673.7, observed [M+Na]⁺ 696.7.

Compound S126

Compound S126 was prepared using the protocol described for compound S113 with 78% of product (S126) yield as an oil. ESI MS for C₅₁H₆₀N₃O₈P Calculated 874.0, Observed 896.9 [M+Na]⁺, 913.0 [M+K]⁺; ³¹P NMR (202 MHz, CDCl₃, ppm): δ148.90, 148.76.

Synthesis of Abasic Spacer S131—General Scheme:

Compound S127

To a solution of S109 (2.56 g, 11.4 mmol) in dichloromethane (50 mL) under argon were added bromoacetonitrile (3.01 g, 25.1 mmol), silver(I) oxide (5.28 g, 22.8 mmol), and tetrabutylammonium iodide (0.84 g, 2.28 mmol), and the resulting mixture was stirred overnight. The mixture was filtered over Celite®, and the filtrate was evaporated to give a black residue, which was subjected to flash silica gel column purification on ISCO companion (hexane/ethyl acetate, 15-90%) to give 1.34 g (39%) of the desired compound S127 as a viscous oil. ESI MS for C₁₆H₁₈N₂O₄ calculated 302.3, observed [M+H]⁺ 303.3.

Compound S128

To a solution of compound S127 (1.34 g, 4.43 mmol) in THE (30 mL) was added a solution of LiAlH₄ in THE (2M, 8.9 mL, 17.7 mmol) under argon, and the mixture was heated to 55° C. for 4 h. Another portion of LiAlH₄ in THE (2M, 4 mL, 8.0 mmol) was added, and the stirring continued for 4 h. After completion of the reaction, the mixture was cooled to room temperature and quenched with Na₂SO₄.10H₂O. The solid was filtered off and washed with ethyl acetate. The filtrate was dried over anhydrous Na₂SO₄. The mixture was filtered and evaporated to give a residue, which was dissolved in dichloromethane (20 mL). To this solution were added Fmoc-OSu (1.5 g, 4.43 mmol) and DIEA (0.87 mL, 5.0 mmol). The mixture was stirred for 1 h, then evaporated to give a residue, which was subjected to flash silica gel column purification on a ISCO companion (hexane/ethyl acetate, 20-90%) to give 1.04 g (31%) of the compound S128 as a white foam. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.75 (4H, dd, J 7.5, 4.5 Hz), 7.58 (4H, t, J 7.0 Hz), 7.48 (2H, d, J 7.0 Hz), 7.41-7.34 (7H, m), 7.32-7.26 (4H, m), 5.44 (1H, s), 5.15-5.05 (2H, m), 4.44 (2H, d, J 5.5 Hz), 4.38 (2H, d, J 6.0 Hz), 4.25-4.15 (2H, m), 4.10 (2H, d, J 11.5 Hz), 3.82 (2H, d, J 11.5 Hz), 3.78 (2H, s), 3.53 (2H, s), 3.42 (2H, s), 3.36-3.27 (4H, m), 3.25 (2H, s); ESI MS for C₄₆H₄₆N₂O₈ calculated 754.9, observed [M+H]⁺ 755.3.

Compound S129

Compound S128 (1.1 g, 1.51 mmol) was dissolved in AcOH/H₂O mixture (10 mL, 3:1), and the reaction was continued at 55° C. for 5 h. After completion of the reaction, the volatiles were evaporated and co-evaporated with toluene (2×20 mL), and the residue was subjected to flash silica gel column purification on a ISCO companion (hexane/ethyl acetate, 30-100%) to give 0.54 g (54%) of the compound S129 as white foam. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.75 (4H, d, J 7.5 Hz), 7.58 (4H, d, J 7.5 Hz), 7.39 (4H, t, J 7.5 Hz), 7.30 (4H, t, J 7.5 Hz), 5.20-5.05 (2H, m), 4.41 (4H, d, J 6.5 Hz), 4.21 (4H, t, J 6.5 Hz), 3.64 (4H, s), 3.48 (8H, s), 3.36 (4H, s); ESI MS for C₃₉H₄₂N₂O₈ calculated 666.7, observed [M+H]⁺ 667.3.

Compound S130

To a solution of diol S129 (0.73 g, 1.1 mmol), DIPEA (0.19 mL, 1.1 mmol) and DMAP (0.013 g, 0.11 mmol) in dichloromethane (6 mL) at 0° C. was added a solution of DMTrCl (0.34 g, 0.99 mmol) in dichloromethane (1 mL) dropwise. The resulting mixture was warmed to room temperature and stirred overnight. the mixture was evaporated to give a residue, which was subjected to flash silica gel column purification on a ISCO (hexane/ethyl acetate, 20-100%) to give 0.47 g (44%) of the mono dimethoxytrityl protected compound S130 as a white foam. ¹H NMR (500 MHz, CDCl₃, ppm): δ7.75 (4H, d, J 7.5 Hz), 7.58 (4H, d, J 7.5 Hz), 7.39 (4H, t, J 7.5 Hz), 7.32-7.25 (8H, m), 7.17 (4H, d, J 6.5 Hz), 6.83 (4H, d, J 6.5 Hz), 5.20-5.05 (2H, m), 4.41 (4H, d, J 6.5 Hz), 4.21 (4H, t, J 6.5 Hz), 3.82 (6H, s), 3.64 (4H, s), 3.48 (8H, s), 3.36 (4H, s); ESI MS for C₆₀H₆₀N₂O₁₀ calculated 969.1, observed [M+Na]⁺ 991.3.

Compound S131

A solution of bis-(N,N-disiopropylamino)-chlorophosphine (0.085 g, 0.32 mmol) in dry CH₂Cl₂ (1.0 mL) were added dropwise to a solution of 3-Fmoc-amino-propan-1-ol (0.090 g, 0.30 mmol) and N,N-diisopropylethylamine (0.18 mL, 1.05 mmol) in dry CH₂Cl₂ (3.0 mL) at −78° C. The reaction mixture was warmed to room temperature and stirred for 1.5 h. A solution of compound S130 (0.30 g, 0.30 mmol) in 1.0 mL of dry CH₂Cl₂ was added, and the resulting mixture was stirred for 10 min. A solution of ETT (0.72 mL, 0.25M in acetonitrile, 0.18 mmol) was added to the reaction mixture, and the resulting mixture was stirred for 3 h. The mixture was diluted with CH₂Cl₂ (20 mL) and washed with saturated aqueous sodium bicarbonate (20 mL) and brine (20 mL). The organic layer was dried over anhydrous sodium sulfate, and the filtrate was evaporated in vacuum to afford a residue, which was subjected to flash silica gel column purification on a ISCO companion using ethyl acetate/hexane with 3% triethylamine as a co-solvent system (0-30% gradient) to give 0.12 g of product S131 (32%) as a white foam. ESI MS for C₈₄H₉₁N₄O₁₃P Calculated 1395.6, Observed 1395.7[M]⁺; ³¹P NMR (202 MHz, CDCl₃): δ146.41.

Compound dT4

Synthesis of FmocNH-PEG2-hydroxyl-diisopropylamino-dT(5′-DMT) phosphoramidite (dT4). A stirring suspension of 5′-DMT-deoxythymidine (4.30 g, 7.89 mmol) and DIEA (1.51 mL, 8.68 mmol) in CH₂Cl₂ (40 mL) was cooled to −78° C. under argon. A solution of bis(diisopropylamino)chlorophosphine (2.32 g, 8.68 mmol) in CH₂Cl₂ (10 mL) was added dropwise. The mixture was removed from the cooling bath and stirred for 1 h. FmocNH-Peg2-OH (S108, 2.93 g, 7.89 mmol) in CH₂Cl₂ (15 mL) was added to the reaction mixture followed by a solution of ETT (0.25 M in acetonitrile, 18.9 mL). After stirring overnight, the mixture was concentrated in vacuo, re-dissolved in EtOAc, and washed with sat. NaHCO₃ (aq.) and brine. The organic layer was removed in vacuo to afford a white foam. This crude material was purified by SiO₂ chromatography to provide the title phosphoramidite (dT4, 4.1 g, 50% yield).

Synthetic protocol described above was used for the synthesis of other phosphoramidite precursors of varying triesters.

Compound dU6

To a solution of dU1 (3.3 g, 5.0 mmol), 1-methylimidazole (1.2 mL, 15.0 mmol) and iodine (1.9 g, 15.0 mmol) in THF (10 mL) under Ar (g) at room temperature was added a solution of tert-butyldimethylsilyl chloride (0.8 g, 5.5 mmol) in THF (5 mL) dropwise with stirring. Reaction stirred at room temperature for 1 hour. TLC confirmed the completion of the reaction. Solvent was remove in vacuo, crude was dissolved in ethyl acetate and washed with aq. Na₂S₂O₃ (conc). Dried organic phase over Na₂SO₄, filtered and evaporated liquor. Crude was purified by flash silica gel column using an ISCO companion (hexanes/ethyl acetate, 0-50%) to give dU2 as a solid in quantitative yield. NMR consistent with published. Nucleic Acids Research, 2011, Vol. 39, No. 9, 3962-3971.

A solution of dU2 (3.9 g, 5.0 mmol) dissolved in an 80% aqueous acetic acid solution (40 mL) with triisopropylsilane (1.0 mL, 5.0 mmol) was stirred at room temperature for 1 hour. TLC confirmed the completion of the reaction. Remove solvent in vacuo. Crude was purified by a flash silica gel column using an ISCO companion (hexanes/ethyl acetate, 0-60%) to give 1 g (43%) of the desired compound dU3 as a solid. ESI MS for C₁₅H₂₅IN₂O₅Si calculated 468.4, observed [M+Na]⁺ 491.0.

To a solution of dU3 (1.0 g, 2.2 mmol) in THF (20 mL) under Ar (g) and cooled to 0° C. in an ice water bath was added sodium hydride (60% dispersion, 0.2 g, 4.7 mmol). The reaction was stirred for 30 minutes at 0° C. Iodomethane (0.7 mL, 10.8 mmol) was added dropwise and the reaction was stirred at 0° C. for 3 hours. RP-HPLC/MS confirmed the completion of the reaction. Reaction was quenched with 20 mL of methanol at 0° C. and warmed to room temperature. Aq. NaHCO₃ (sat.) was added and the mixture was extracted with CH₂Cl₂. Organic phase was dried over Na₂SO₄, filtered and liquor concentrated in vacuo. Purification by silica gel column chromatrography (hexanes/ethyl acetate, 0-50%) gave solid dU4 (0.6 g, 58% yield). ESI MS for C₁₆H₂₇IN₂O₅Si calculated 482.4, observed [M+H]⁺ 483.1.

Tert-butylammonium fluoride (1 M THF, 3 mL, 3.0 mmol) was added dropwise with stirring to a cooled (0° C.) solution of dU4 (0.6 g, 1.3 mmol) dissolved in THE (20 mL) under Ar (g). The cooled solution was stirred for 30 minutes then warmed to room temperature. After 3.5 hours, RP-HPLC/MS confirmed the completion of the reaction. The crude product was purified by silica gel column chromatography (dichloromethane/methanol, 0-10%) to give solid dU5 (0.4 g, 92% yield). ESI MS for C₁₀H₁₃IN₂O₅ calculated 368.1, observed [M+H]⁺ 369.0.

To a solution dU5 (0.4 g, 1.2 mmol) in dichloromethane (5 mL) under Ar (g) at room temperature was added a solution of 2′-cyanoethyl-N, N, N′, N′-tetraisopropyl phosphoramidite (0.4 mL, 1.3 mmol) in dichloromethane (5 mL) dropwise with stirring. Reaction stirred for 30 minutes at room temperature. Ethylthiotetrazole (0.25 M solution in ACN, 2.9 mL, 0.7 mmol) was then added and the reaction was continued overnight. TLC confirmed the completion of the reaction. Solvent removed in vacuo and the crude mixture was diluted with 20 mL of dichloromethane, washed sequentially with a saturated NaHCO₃ solution (10 mL) and brine (10 mL). Dried organic phase over Na₂SO₄, filtered and evaporated liquor. Crude mixture was dissolved in ethyl acetate and purified by silica gel column using an Isco companion (hexanes/ethyl acetate, 0-100%) to give 0.3 g (49.9%) of the desired compound dU6 as a solid. ESI MS for C₁₉H₃₀N₄O₆P Calculated 568.3, Observed 567.3 [M−H]⁻; ³¹P NMR (202 MHz, CDCl₃, ppm): δ149.25.

Compound dU9

The title compound was prepared by reacting dU3 under standard reaction conditions shown below. ³¹P-NMR (202 mHz, CDCl₃, ppm): δ149.42, 149.31; MS ESI− m/z found 667.1 [M−H]. MS ESI+ m/z found 669.2 [M+H], 691.3 [M+Na].

Preparation of Linkers Bonded to Auxiliary Moieties: Compounds PP2, PP3, and PP4

Preparation of (5-Azidovaleryl)-ε-N-Boc lysine (PP1). s-N-Boc lysine (9.46 g, 38.4 mmol) and K₂CO₃ (2.67 g, 19.3 mmol) were dissolved in 1:1 THF:H₂O (60 mL). Pentafluorophenyl-5-azidovalerate (10.8 g, 34.9 mmol) in THE (10 mL) was added, and the reaction stirred overnight at room temperature. The desired product was observed by RP-HPLC-MS, 394.2 [M+Na]. The reaction was acidified to pH 5 by titration with 1 N HCl (aq.), and the product was extracted with EtOAc (3×100 mL). The organic layer was washed sequentially with H₂O (50 mL) and brine (50 mL). The organic layer was dried over MgSO₄ and concentrated in vacuo to a thick syrup. The crude product was purified by silica gel column chromatography to afford the desired product PP2 as white needles (8.1 g, 62% yield). ESI MS+ mass calculated C₁₆H₂₉N₅O₅: 371.4, found: 394.2 [M+Na]⁺.

General protocol for pegylation of PP1: preparation of (5-Azidovaleryl)-ε-N-(NH-Boc PEG24) lysine (PP4). PP1 (0.74 g, 2.0 mmol) was treated with HCl (2 mL, 4N in dioxane) for 4 h. HPLC-MS showed complete deprotection, 272.2 [M+H]⁺. The reaction was diluted with 1:1 H₂O:acetonitrile (10 mL), frozen, and lyophilized overnight to afford PP2 as a white solid in quantitative yield. NHBoc-PEG24 acid (1.1 g, 0.88 mmol) in DMF (3 mL) was activated with HATU (0.34 g, 0.88 mmol), HOBt (0.14 g, 0.88 mmol), and DIEA (0.7 mL, 4.0 mmol) then treated with PP2 (0.24 g, 0.8 mmol) for 2 hours. RP-HPLCMS showed formation of the desired PP4. The crude was purified by RP-HPLC to afford PP4 as a white solid (0.55 g, 46% yield). ESI MS+ mass calculated C₆₇H₁₃₀N₆O₃₀: 1499.77, found: 1499.9 [M+H]⁺, 1400.8 [M−Boc]⁺.

BisPegX-NH2 and TrisPegX-NH2 (where X=various PEG lengths) were prepared from commercially available starting materials using procedures described in WO2015/188197.

General protocol for pegylation of PP2, PP3, and PP4: Lysine PP1 (38 mg, 0.1 mmol) dissolved in DMF (1 mL) was treated with HATU (37 mg, 0.1 mmol), N,N-diisopropylethylamine (49 mL, 0.3 mmol), and mPEG48-NH₂ (200 mg, 0.09 mmol). RP-HPLC-MS showed complete PEG48 addition to PP1. The crude was purified by RP-HPLC to afford NHBoc PP7 as a white solid (97 mg, 42% yield). ESI MS+ mass calculated C₁₁₃H₂₂₄N₆O₅₂: 2499.03, found: 833.7 [M+3H]³⁺, 625.6 [M+4H]⁴⁺. PP7 was deprotected with HCl (2 mL, 4N in dioxane) for 4 h. HPLC-MS showed complete deprotection, as observed by the disappearance of the peak having a mass of the starting material. The reaction was diluted with 1:1 H₂O:acetonitrile (10 mL), frozen, and lyophilized overnight to quantitatively afford a white solid PP8. ESI MS+ mass calculated C₁₀₈H₂₁₆N₆O₅₀: 2398.88, found: 1199.8 [M+2H]²⁺, 800.3 [M+3H]³⁺, 600.5 [M+4H]⁴⁺, 480.6 [M+5H]⁵⁺.

In this Scheme, conditions are:

A) 6-methytetrazine-OSu, HATU, Hünig's base, DMF; and

B) DBCO-CpG, acetonitrile/H₂O;

where-6-methyl tetrazine-OSu is of the following formula:

and

DBCO-CpG is of the following formula:

General Protocol for Preparation of Linkers Loaded with Polynucleotides (PP28 and PP30).

Tetrazine-conjugation handle of PP12 and PP16: PP12 (43 mg, 0.12 mmol) was dissolved in DMF (0.5 mL), treated with HATU (4.6 mg, 0.12 mmol), DIEA (12.7 μL, 0.73 mmol), and, after 5 min, with 6-methyl-tetrazine-OSu (19.9 mg, 0.61 mmol). The crude reaction was stirred for 30 min at room temperature RP-HPLCMS showed complete coupling of 6-methyl-tetrazine carboxylate to PP12. The crude was purified by RP-HPLC, and the pooled fractions were lyophilized to afford PP27 as a purple solid (39 mg, 85% yield). ESI MS+ mass calculated C₁₇₀H₃₂₅N₁₁O₇₆: 3739.47, found: 833.7 [M+3H]³⁺, 625.6 [M+4H]⁴. Pure PP27 was treated in DBCO-CpG in acetonitrile:water (1:1) and incubated at 37° C. for 1-2 hours and an additional 1 hour at room temperature to give PP28. PP28 was purified by preparative AEX (20 mM phosphate and 20 mM phosphate-1 M sodium bromide).

Alternative one-pot route to CpG loaded linkers PP28 and PP30. PP12 (400 nmol) is treated with DBCO-CpG (420 nmol) in acetonitrile:water (1:1) and incubated at 37° C. for 1-2 hours then an additional 1 hour at room temperature. Tetrazine-OSu (4000 nmol) in DMSO stock solution is added to crude PP12-DBCO-CpG solution and the purple solution is reacted for 3 hours at room temperature for 1-2 hours to afford PP28. The crude PP28 was purified by preparative RP-HPLC (50 mM TEAA in water and 10% acetonitrile:water) or preparative AEX (20 mM phosphate and 20 mM phosphate-1M sodium bromide).

Preparation of Tetrazine-PEG24-OPFP (PP32). To a solution of amino-PEG24-carboxylic acid (1.0 g, 0.9 mmol) and diisopropylethylamine (0.8 mL, 4.4 mmol) in DMF/water (1:1, 12 mL) under Ar (g) was added methyltetrazinephenylacetyl succinimidyl ester (370 mg, 1.1 mmol) in DMF (3 mL) dropwise with stirring. Reaction stirred at room temperature for 2 hours. RP-HPLC/MS indicated formation of product. Solvent was removed in vacuo and crude was purified by RP-HPLC (TFA modifier) to provide PP31, 1.1 g (80%). ESI MS for C₆₂H₁₁₁N₅O₂₇ calculated 1358.56, observed [M+H]⁺ 1358.8. To a solution of PP31 (109 mg, 0.08 mmol) in dichloromethane (3 mL) under Ar (g) was added anhydrous pyridine (32 mg, 0.4 mmol) and pentafluorophenyl trifluoroacetate (67 mg, 0.24 mmol). Reaction stirred at room temperature overnight. Solvent was removed in vacuo. Crude product was redissolved in EtOAc and washed with aq. NaHCO₃ (5% w/v) (3×) and brine (1×). Organic phase was dried over Na₂SO₄, filtered, and concentrated in vacuo to give PP32 quantitatively. Used in next step without further purification. ESI MS for C₆₈H₁₁₀F₅N₅O₂₇ calculated 1524.61, observed [M+2H]²⁺763.0.

Preparation of PP34. To a solution of mPEG48-amine (2.15 g, 1.00 mmol) and diisopropylethylamine (0.87 mL, 5.00 mmol) in DMF/water (1:1, 10 mL) under Ar (g) was added Na-Cbz-Nc-Boc-L-Lysine succinimidyl ester (570 mg, 1.2 mmol) in DMF (5 mL) dropwise with stirring. Reaction mixture was stirred at room temperature for 2 hours. RP-HPLC/MS indicated formation of product, PP33. The reaction mixture was concentrated in vacuo and purified by silica gel chromatography (CH₂Cl₂:MeOH 0-10%). Recovered PP33 was used directly in next reaction. ESI MS for C₁₁₆H₂₂₃N₃O₅₃ calculated 2508.0, observed [M+3H]³⁺ 836.7, [M+4H]⁴⁺ 627.9. A solution of PP33 (1.00 mmol) in MeOH was flushed with nitrogen (g), and Palladium on activated carbon (10% wt, catalytic) was added. The solution was alternately evacuated and purged with hydrogen (g) (3×). RP-HPLC/MS after 2 hours showed formation of PP34. The heterogeneous mixture was filtered through a bed of Celite and washed with copius amounts of methanol. Removal of the solvent in vacuo, yielded PP34, (2.0 g, 84% yield, over 2 steps). ESI MS for C₁₀₈H₂₁₇N₃O₅₁ calculated 2373.87, observed [M+3H]³⁺792.0.

Preparation of PP37. To a solution of PP32 (124 mg, 0.08 mmol) and diisopropylethylamine (31 mg, 0.24 mmol) in DMF/water (1:1, 10 mL) under Ar (g) was added PP34 (230 mg, 0.1 mmol) in DMF/water (1:1, 10 mL) dropwise with stirring. The reaction was stirred at room temperature for 2 hours and RP-HPLC/MS indicated formation of product PP35. Solvent was removed in vacuo and PP35 used in next step without further purification. ESI MS for C₁₇₀H₃₂₆N₈O₇₇ calculated 3714.4, observed [M+4H]⁴⁺ 929.5, [M+5H]⁵⁺ 743.8. Crude PP35 (0.08 mmol) treated with HCl (4 N in dioxane, 5 mL) under Ar (g). Reaction was stirred at room temperature for 2 hours and RP-HPLC/MS indicated complete removal of Boc protecting group. The solvent was removed in vacuo and the amine was acylated with a solution of bis-Peg3-PFP ester (230 mg, 0.4 mmol) in DMF (5 mL) and diisopropylethylamine (140 uL, 0.8 mmol). After 2 hours, RP-HPLC/MS indicated formation of product PP37 Solvent was removed in vacuo and crude was purified by RP-HPLC (TFA modifier) to provide PP37 as a tetra-TFA salt, 31 mg in 8.7% yield. ESI MS for C₁₈₁H₃₃₃F₅N₈O₈₁ calculated 4012.56, observed [M+3H]³⁺ 1338.3, [M+4H]⁴⁺ 1004.0, [M+5H]⁵⁺ 803.4, [M+6H]⁶⁺ 669.

List of the Linkers Containing Auxiliary Moieties:

Z MS MS found Linker Valency X Y (tether) Formula calc. (ESI+) PP6 mono 24 H N₃- C₆₀H₁₂₀N₆O₂₆ 1341.62 1341.7, 671.5 valeramide PP8 mono 48 H N₃- C₁₀₈H₂₁₆N₆O₅₀ 2398.88 1199.8, 800.3, valeramide 600.5, 480.6 PP10 mono 48 CO-PEG08- N₃- C₁₂₇H₂₅₃N₇O₅₉ 2822.38 1412.0, 941.7, NH₂ valeramide 706.5, 565.4, 471.4 PP12 mono 48 CO-PEG24- N₃- C₁₅₉H₃₁₇N₇O₇₅ 3527.21 1176.5, 882.6, NH₂ valeramide 706.3 PP14 bis 24 CO-PEG08- N₃- C₁₃₄H₂₆₅N₉O₆₁ 2978.56 1490.1, 993.7, NH₂ valeramide 745.6, 596.7, 497.4 PP16 bis 24 CO-PEG24- N₃- C₁₆₆H₃₂₉N₉O₇₇ 3683.39 1228.6, 921.7, NH₂ valeramide 737.6, 615.0 PP18 bis 48 CO-PEG08- N₃- C₂₃₀H₄₅₇N₉O₁₀₉ 5093.08 1247.2, NH₂ valeramide 1019.6, 849.8, 728.6, 637.7 PP20 bis 48 CO-PEG24- N₃- C₂₆₂H₅₂₁N₉O₁₂₅ 5797.93 1450.3, NH₂ valeramide 1160.4, 967.1, 829.1, 725.8 PP22 tris 24 H N₃- C₁₇₁H₃₃₉N₉O₈₀ 3801.52 1268.0, 951.2, valeramide 761.2 PP24 tris 24 CO-PEG08- N₃- C₁₉₀H₃₇₆N₁₀O₈₉ 4225.02 1409.3, NH₂ valeramide 1057.0, 846.0, 705.2, 604.6 PP26 tris 24 CO-PEG24- N₃- C₂₂₂H₄₄₀N₁₀O₁₀₅ 4929.87 1233.3, 968.8 NH₂ valeramide PP27 mono 48 CO-PEG24- N₃- C₁₇₀H₃₂₅N₁₁O₇₆ 3739.47 1247.2, 935.7, Tetrazine valeramide 748.8, 624.1, 535.3 PP28 mono 48 CO-PEG24- p313 + N₃- 8893.7 8891, Tetrazine valeramide deconvoluted ESI- PP29 bis 24 CO-PEG24- N₃- C₁₇₇H₃₃₇N₁₃O₇₈ 3895.66 974.8, 780.0 Tetrazine valeramide PP30 bis 24 CO-PEG24- p313 + N₃- 9049.9 9046, Tetrazine valeramide deconvoluted ESI- PP37 mono 48 PFP-PEG3 CO-PEG24- C₁₈₁H₃₃₃N₈O₈₁ 4012.56 1338.3, Tetrazine 1004.0, 803.4, 669.6 PP38 bis 48 CO-PEG24- p313 + N₃- 11163.2 11159, Tetrazine valeramide deconvoluted ESI- PP39 tris 24 CO-PEG24- p313 + N₃- 10281.1 10292, Tetrazine valeramide deconvoluted ESI-

In the above table, groups identified as Y or Z have the following structures:

In the table above, group Z identified as “p313+N₃-valeramide” refers to a product of a cycloaddition reaction between p313 and a linker having N₃-valeramide as Z.

The phosphoramidite monomers shown in Table 1 were synthesized using the standard synthetic procedures described herein and in WO 2015/188197.

The bicyclic oxazaphospholidine monomers used in chiral phosphorothioate oligonucleotide synthesis were prepared using literature protocol as reported by Wada, J. Am. Chem. Soc. 130:16031-16037, 2008.

TABLE 1 Com- pound ³¹P NMR (δ in ppm) Yield # Structure and/or ESI MS (%) dT1

ESI MS calculated 747.8, observed 746.9 [M − H] ³¹P NMR (202 MHz, CDCl₃): δ147.50, 147.00 dC1

— dA1

ESI MS calculated 860.97, observed 859.9 [M − H], 862.0 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ147.47, 147.35 dG1

ESI MS calculated 842.96, observed 841.7 [M − H], 843.9 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ147.05, 147.93 dT2

ESI MS calculated 743.8, observed 742.8 [M − H], 744.7 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ148.26, 147.77 dC2

— dA2

— dG2

— dT3

ESI MS calculated 916.1, observed 915.6 [M − H] ³¹P NMR (202 MHz, CDCl₃): δ147.72, 147.21 dC3

— dA3

— dG3

— dT4

ESI MS calculated 1045.2, observed 1046.3 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ148.38, 148.27 dC4

ESI MS calculated 1088.2, observed 1089.0 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ149.29, 148.66 dA4

ESI MS calculated 1158.3, observed 1157.5 [M − H], 1159.0 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ148.38 dG4

ESI MS calculated 1140.3, observed 1139.1 [M − H], 1141.2 [M + H] ³¹P NMR (202 MHz, CDCl₃): δ147.76 dT5

ESI MS calculated 1011.2, observed 978.6 [M − H] ³¹P NMR (202 MHz, CDCl₃): δ147.51, 147.32 dC5

— dA5

— dG5

— dT6

— dC6

— dA6

— dG6

— dT7

³¹P NMR (202 MHz, CDCl₃): δ 147.05 (d, J 8.08 Hz), 146.58 (d, J 8.08 Hz) ESI MS calculated 992.45, observed 994.3 (M + H), 992.0 (M − H) 42 dT8

³¹P NMR (202 MHz, CDCl₃): δ 147.80 ESI MS calculated 881.99, observed 880.9 (M − H), 904.9 (M + Na) 14 dU7 (Rp)

³¹P NMR (202 MHz, CDCl₃): δ156.19 (s) 31 dU8 (Sp)

³¹P NMR (202 MHz, CDCl₃): δ155.78 (s) 27 dC7 (Rp)

³¹P NMR (202 MHz, CDCl₃): δ156.75 (s) 21 dC8 (Sp)

³¹P NMR (202 MHz, CDCl₃): δ156.08 (s) 25 Chiral Abasic Spacers—Compounds X7, X8, X9 and X10:

X7 and X8 Synthesis:

X9 and X10 Synthesis:

The following are further hydrophilic nucleoside phosphoramidites that can be prepared using methods known in the art and methods described herein:

where R is OH, optionally substituted amino, or —CO₂R¹ (R¹ is H or a counterion), and n is an integer from 1 to 4,

where R is OH, OAc, OMe, optionally substituted amino, or CO₂R¹ (R¹ is H or a counterion), and n is an integer from 1 to 51.

The following are further substituted nucleoside phosphoramidites that can be prepared using methods known in the art and methods described herein:

where each of R and R¹ is independently H or optionally substituted C₁₋₆ alkyl (e.g., Me, Et, i-Pr, or n-Bu).

The following phosphoramidites are purchased from Glen Research (Sterling, Va.) or ChemGenes (Wilmington, Mass.) or prepared using standard protocols described herein:

These intermediates may be used in the preparation of polynucleotides of the invention (e.g., polynucleotides containing a 5′-terminal modified nucleoside). Non-limiting examples of 5′-terminal modified nucleosides are 5-halouridine, 5-alkynyluridine, 5-heteroaryluridine, and 5-halocytidine.

5′-Capping:

Synthesis of Small Molecule-based Targeting Moieties

Exemplary compounds useful for the preparation of small molecule-based targeting moieties are described in WO 2015/188197 (e.g., compounds M1-M30 described in WO 2015/188197).

Synthesis of Glucitol Auxiliary Moieties

Exemplary compounds useful for the preparation of glucitol-based auxiliary moieties are described in WO 2015/188197 (e.g., compounds POH1-POH10 described in WO 2015/188197).

General Polynucleotide Synthesis:

Experimental Details

Automated polynucleotide synthesis (1 μmol scale) was carried out on MerMade 6 or 12 with the following reagents and solvents:

-   -   Oxidizer—0.02M I₂ in THF/pyridine/H₂O (60 s oxidation per         cycle),     -   Sulfurizing Reagent II—dithiazole         derivative/pyridine/acetonitrile (0.05 M, in 6:4         pyridine:acetonitrile) (60 s per cycle)     -   Deblock—3% trichloroacetic acid (2×40 s deblocks per cycle),     -   Cap Mix A—THF/2,6-lutidine/Ac2O (60 s capping per cycle), and     -   Cap Mix B—16% methyl imidazole in THE (60 s capping per cycle)

Exceptions to standard polynucleotide synthesis conditions were as follows:

-   -   CPG supports with a non-nucleosidic linker called Uny-linker was         used.     -   All 2′-deoxyribose-phosphoramidites were resuspended to 100 mM         in 100% anhydrous acetonitrile prior to synthesis, except some         of the modified 2′-deoxy-phosphoramidites were dissolved to 100         mM in THE/acetonitrile mixture (1:4) depend on the solubility of         the starting material.     -   Phosphoramidite activation was performed with a 2.5-fold molar         excess of 5-benzylthio-1H-tetrazole (BTT). Activated         2′-deoxyribose-phosphoramidites were coupled for 2×1 minute         coupling per insertion and modified phosphoramidites were         coupled for 2×3 minute coupling per insertion.     -   Sulfurization of the backbone was performed with 0.05M         Sulfurizing Reagent II in pyridine/acetonitrile (6:4) for 1 min.         Polynucleotide Deprotection & Purification Protocol:

Following automated polynucleotide synthesis, solid support and base protecting groups (such as A-Bz, C-Ac, G-iBu, etc.) and methyl esters of phosphotriesters were cleaved and de-protected in 1 mL of AMA (1:1 ratio of 36% aq. ammonia and 40% methylamine in methanol) for 2 h or more at room temperature followed by centrifugal evaporation.

Crude polynucleotide pellets were resuspended in 100 μL of 50% acetonitrile, briefly heated to 65° C. and vortexed thoroughly.

For polynucleotide purification, 100 μL crude polynucleotides were injected onto RP-HPLC with the following buffers/gradient:

-   -   Buffer A=50 mM TEAA in Water;     -   Buffer B=90% Acetontrile; and     -   Flow Rate=1 mL/min;     -   Gradient:         -   0-2 min (100% Buffer A/0% Buffer B),         -   2-42 min (0% to 60% Buffer B), and         -   42-55 min (60% to 100% Buffer B).             DBCO Conjugation and Purification Protocol:

DBCO NHS ester was conjugated to the crude 2′-deoxy DMT-polynucleotide as described here. The crude polynucleotide pellet was suspended into 45 μL DMSO, briefly heated to 65° C. and vortexed thoroughly. 5 μL of DIPEA was added followed by DBCO-NHS ester (30 eq), which was pre-dissolved in DMSO (1M). The reaction was allowed to stand for 10 minutes or until product formation was confirmed by MALDI. Total 80 μL of crude polynucleotide samples were injected onto RP-HPLC with the following buffers/gradient:

-   -   Buffer A=50 mM TEAA in Water     -   Buffer B=90% Acetonitrile     -   Flow Rate=1 mL/min     -   Gradient:         -   0-2 min (90% Buffer A/10% Buffer B)         -   2-42 min (0% to 60% Buffer B)         -   42-55 min (60% to 100% Buffer B).

Across the dominant RP-HPLC peaks, 0.5 mL fractions were collected and analyzed by MALDI-TOF mass spectrometry to confirm presence of desired mass. Mass-selected, purified fractions were frozen and lyophilized. Once dry, fractions were re-suspended, combined with corresponding fractions, frozen and lyophilized.

DMT Cleavage: lyophilized pellets were suspended in 20 μL of 50% acetonitrile and added 80 μL of acetic acid, samples were kept standing at room temperature for 1 h, frozen and lyophilized. The dried samples were re-dissolved in 20% acetonitrile and desalted through NAP 10 (Sephadex™-G25 DNA Grade) columns. Collected, pure fractions were frozen and lyophilized for final product.

General Conjugation Schemes Using Abasic Spacers:

Click reaction—General Scheme:

where

each q is 0 or 1;

each m is an integer from 0 to 5;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

R is a bond to H, a nucleoside in a polynucleotide, to solid support, or to a capping group (e.g., —(CH₂)₃—OH);

each R′ is independently H, -Q¹-Q^(A1), a bioreversible group, or a non-bioreversible group;

each R″ is independently H, -Q¹-Q^(A)-Q²-T, a bioreversible group, or a non-bioreversible group;

each R^(A) is independently H or —OR^(C), where R^(C) is -Q¹-Q^(A1), a bioreversible group, a non-bioreversible group, or a bond to solid support;

each R^(B) is independently H or —OR^(D), where R^(D) is -Q¹-Q^(A)-Q²-T, a bioreversible group, or a non-bioreversible group;

where

-   -   each Q¹ is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to Q^(A) or         Q^(A1); a second valency is open, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety;     -   each Q² is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to Q^(A); a         second valency is bonded to T, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety;     -   Q^(A) is 1,2,3-triazole-1,4-diyl, optionally substituted C₆₋₁₆         triazoloheterocyclylene

optionally substituted C₈₋₁₆ triazolocycloalkenylene

or a dihydropyridazine group

-   -   Q^(A1) is optionally substituted C₂₋₁₂ alkynyl, optionally         substituted C₆₋₁₆ heterocyclyl containing an endocyclic         carbon-carbon triple bond

optionally substituted C₈₋₁₆ cycloalkynyl

or optionally substituted C₄₋₈ strained cycloalkenyl (e.g., rans-cyclooctenyl); and

-   -   T is a targeting moiety,     -   provided that the starting materials contain at least one         -Q¹-Q^(A1), and products contain -Q¹-Q^(A)-Q²-T; and     -   provided that the starting materials and products contain 0 or 1         bonds to a solid support.         Conjugation Methods         Cu-Catalyzed Click Reaction

Copper-THPTA Complex Preparation

A 5 mM aqueous solution of copper sulfate pentahydrate (CuSO₄-5H₂O) and a 10 mM aqueous solution of tris(3-hydroxypropyltriazolylmethyl)amine (THPTA) were mixed 1:1 (v/v) (1:2 molar ratio) and allowed to stand at room temperature for 1 hour. This complex can be used to catalyze Huisgen cycloaddition, e.g., as shown in the general conjugation schemes below.

General Procedure (100 nM Scale):

To a solution of 710 μL of water and 100 μL tert-butanol (10% of final volume) in a 1.7 mL Eppendorf tube was added 60 μL of the copper-THPTA complex followed by 50 μL of a 2 mM solution of the oligo, 60 μL of a 20 mM aqueous sodium ascorbate solution and 20 μL of a 10 mM solution of targeting moiety-azide. After thorough mixing the solution was allowed to stand at room temperature for 1 hour. Completion of the reaction was confirmed by gel analysis. The reaction mixture is added to a screw cap vial containing 5-10 fold molar excess of SiliaMetS® TAAcONa (resin bound EDTA sodium salt). The mixture is stirred for 1 hour. This mixture is then eluted through an Illustra™ Nap™-10 column Sephadex™. The resulting solution is then frozen and lyophilized overnight.

Conjugation Through Amide Linkage:

Conjugation through amidation may be performed under the amidation reaction conditions known in the art. See, e.g., Aaronson et al., Bioconjugate Chem. 22:1723-1728, 2011.

where

each q is 0 or 1;

each m is an integer from 0 to 5;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

R is a bond to H, a nucleoside in a polynucleotide, to solid support, or to a capping group (e.g., —(CH₂)₃—OH);

each R′ is independently H, -Q¹-Q^(A1), a bioreversible group, or a non-bioreversible group;

each R″ is independently H, -Q¹-Q^(A)-Q¹-T, a bioreversible group, or a non-bioreversible group;

each R^(A) is independently H or —OR^(C), where R^(C) is-Q¹-Q^(A1), a bioreversible group, or a non-bioreversible group;

each R^(B) is independently H or —OR^(D), where R^(D) is -Q¹-Q^(A)-Q²-T, a bioreversible group, or a non-bioreversible group;

where

-   -   each Q¹ is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to Q^(A) or         Q^(A1), the second valency is open, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety;     -   each Q² is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to Q^(A), the         second valency is bonded to T, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety;     -   Q^(A) is optionally substituted C₂₋₁₂ heteroalkylene containing         —C(O)—N(H)— or —N(H)—C(O)—;     -   Q^(A1) is —NHR^(N1) or —COOR¹², where R^(N1) is H, N-protecting         group, or optionally substituted C₁₋₆ alkyl, and R¹² is H,         optionally substituted C₁₋₆ alkyl, or O-protecting group; and     -   T is a targeting moiety,     -   provided that the starting materials contain at least one         -Q¹-Q^(A1), and products contain -Q¹-Q^(A)-Q²-T.

Solution Phase Conjugation:

where

m is an integer from 0 to 5;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

R is a bond to H, a nucleoside in a polynucleotide, or to a capping group;

each R′ is independently H, -Q¹-NH₂, a bioreversible group, or a non-bioreversible group; each R″ is independently H, -Q¹-NH—CO-Q²-T, a bioreversible group, or a non-bioreversible group;

each R^(A) is independently H or —OR^(C), where R^(C) is -Q¹-NH₂, a bioreversible group, or a non-bioreversible group;

each R^(B) is independently H or —OR^(D), where R^(D) is -Q¹-NH—CO-Q²-T, a bioreversible group, or a non-bioreversible group;

where

-   -   each Q¹ is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to —NH—CO— or         —NH₂, the second valency is open, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety;     -   each Q² is independently a divalent, trivalent, tetravalent, or         pentavalent group, in which one valency is bonded to —NH—CO—,         the second valency is a bond to T, and each of the remaining         valencies, when present, is independently bonded to an auxiliary         moiety; and     -   T is a targeting moiety,     -   provided that the starting material contains -Q¹-NH₂, and the         product contains -Q¹-NH—CO-Q²-T.

On-Support Conjugation:

where

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

each Q² is independently a divalent, trivalent, tetravalent, or pentavalent group, in which one valency is bonded to —NH—CO—, the second valency is a bond to T, and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety; and

T is a targeting moiety.

where

n is an integer from 1 to 8;

A is O or —CH₂—;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

each Q² is independently a divalent, trivalent, tetravalent, or pentavalent group; in which one valency is bonded to the azide or triazole, a second valency is bonded to T, and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety; and

T is a targeting moiety.

where

n is an integer from 1 to 8;

A is O or —CH₂—;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

each Q² is independently a divalent, trivalent, tetravalent, or pentavalent group; in which one valency is bonded to the azide or triazole, a second valency is bonded to T, and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety; and

T is a targeting moiety.

where

n is an integer from 1 to 8;

A is O or —CH₂—;

Z is O or S;

R^(O) is a bond to a nucleoside in a polynucleotide;

each Q² is independently a divalent, trivalent, tetravalent, or pentavalent group; in which one valency is bonded to the azide or triazole, a second valency is bonded to T, and each of the remaining valencies, when present, is independently bonded to an auxiliary moiety; and

each T is independently a targeting moiety.

Representative Example of Fmoc Deprotection of a Phosphotriester:

A polynucleotide including a phosphotriester with Fmoc-protected amine was subjected to deprotection conditions resulting in Fmoc deprotection without observable conversion of the phosphotriester into a phosphodiester.

DBCO-NHS Conjugation to p68—Representative Example:

DBCO-NHS conjugation to the amino group in the phosphotriester was complete in 10 min at room temperature, as evidenced by mass spectrometric analysis.

RP-HPLC purification of p68 (see Table 2) containing a DBCO conjugating group was performed using the following conditions:

-   -   Buffer A=50 mM TEAA in Water;     -   Buffer B=90% Acetontrile; and     -   Flow Rate=1 mL/min;     -   Gradient:         -   0-2 min (100% Buffer A/0% Buffer B),         -   2-22 min (0% to 100% Buffer B), and         -   22-25 min (100% Buffer B).

A similar procedure may be used to prepare a polynucleotide using, e.g., 2′-modified nucleoside phosphoramidites, such as those described herein. Such a procedure is provided in International Patent application PCT/US2015/034749; the disclosure of the disulfide phosphotriester oligonucleotide synthesis in PCT/US2015/034749 is hereby incorporated by reference.

The general procedure described herein was followed to prepare immunomodulating polynucleotides listed in Table 2.

TABLE 2 Compound # Sequence (5′ to 3′) SEQ ID NO: A B C D E F G H I J p1 tcgtcgttttgtcgttttgtcgtt  1   120 110   175    50 >1000 p2 NH2-C6-  2 tcgtcgttttgtcgttttgtcgtt p3 NH2-C6-S-S-C6-  3 tcgtcgttttgtcgttttgtcgtt p4 DBCO-  4 >1000 >1000 tcgtcgttttgtcgttttgtcgtt p5 DBCO-C6-S-S-C6-  5 tcgtcgttttgtcgttttgtcgtt p6 TCGTCGTTTTGTCGTTT  6 >1000 >1000 >1000 TGTCGTT p7 DBCO-C6-S-S-C6-  7 TCGTCGTTTTGTCGTTT TGTCGTT p8 tgctgcttttgtgcttttgtgctt  8 >1000 >1000 >1000 p9 DBCO-C6-S-S-C6-  9 tgctgcttttgtg cttttgtgctt p10 tcgtcgttttgtcgttttgtcgtt  10 p11 TCGTCGTTTTGTCGTTT  11 TGTCGTT p12 DBCO-C6-S-S-C6-  12 tcgtcgttttgtcgttttgtcgtt p13 DBCO-C6-S-S-C6-  13 TCGTCGTTTTGTCGTTT TGTCGTT p14 DBCO-  14 tcgtcgttttgtcgttttgtcgtt p15 DBCO-  15 TCGTCGTTTTGTCGTTT TGTCGTT p16 DBCO-  16 tccatgacgttcctgacgtt p17 DBCO-  17 TCCATGACGTTCCTGA CGTT p18 tccatgacgttcctgacgtt  18  1000 >1000    40  22.6 24.4    26 p19 DBCO-  19 >1000 >1000 tccatgacgttcctgacgtt p20 TCCATGACGTTCCTGA  20 >1000 >1000 >1000 CGTT p21 DBCO-  21 TCCATGACGTTCCTGA CGTT p22 tccatgagcttcctgagctt  22 >1000 >1000 p23 DBCO-  23 tccatgagcttcctgagctt p24 dtcgtcgtiftgtcgttttgtcgtt  24   500 >1000 p25 tcgtcgttdttgtcgttttgtcgtt  25 >1000   800 p26 tcgtcgtiftgdtcgttttgtcgtt  26 >1000 >1000 p27 tcgtcgttttgtcgttdttgtcgtt  27   500   800 p28 tcgtcgtifigtcgttttgtcgtdt  28   300   800 p29 tcgcgacgttcgcccgacgttcg  29   300 >1000 >1000  92.8    58 gta p30 DBCO-  30 183.7    28 tcgcgacgttcgcccgacgttcg gta p31 tccatgacgttcctgatgct  31  1000 >1000    40  29.6    27 p32 DBCO-  32 >1000 >1000 tccatgacgttcctgatgct p33 tcgacgttcgtcgttcgtcgttc  33   450 103.2   275 p34 DBCO-  34 tcgacgttcgtcgttcgtcgttc p35 tcgtcgttttgtcgttttgtcgtt  35 p36 DBCO-  36 tcgtcgtifigtcgtifigtcgtt p37 tccatgacgttcctgacgtt  37 164.3   180 28.3 p38 DBCO-  38 tccatgacgttcctgacgtt p39 tccatgacgttcctgacgtt-C3  39 122.2 130.8 p40 TCCATGACGTTCCTGA  40 >1000 CGTT p41 TCCATGACGTTCCTGA  41 >1000 CGTT-C3 p42 tccatgacgttcctgacgtt  42  22.6 25.6 p43 tccatgacgttcctgacgtt-C3  43  19.2 p44 TCCATGACGTTCCTGA  44 >1000 CGTT p45 TCCATGACGTTCCTGA  45 CGTT-C3 p46

ccatgacgttcctgacgtt  46   876 p47 tcca

gacgttcctgacgtt  47   615   p48 tccatgacg

tcctgacgtt  48 197.2 p49 tccatgacgt

cctgacgtt  49  75.2 p50 tccatgacgttcc

gacgtt  50  71.3 p51 tccatgacgttcctgacg

t  51   9.3 p52 tccatgacgttcctgacgt

 52  29.1 p53 GGgggacgatcgtcGGGGG  53 G p54 tcgtcgtcgttcgaacgacgttgat  54   816 p55 tcgtcgttttcggcgcgcgccg  55 31.4 p56 tcgcgaacgttcgccgcgttcga  56 45.5 acgcgg p57 tcgtcgacgatcggcgcgcgcc  57 g p58 t ccatgacgttcctgacgtt  58 p59 tcca t gacgttcctgacgtt  59 p60 tccatgacg t tcctgacgtt  60 p61 tccatgacgt t cctgacgtt  61 p62 tccatgacgttcc t gacgtt  62 p63 tccatgacgttcctgacg t t  63 p64 tccatgacgttcctgacgt t  64 p65 T CCATGACGTTCCTGA  65 CGTT p66 TCCA T GACGTTCCTGA  66 CGTT p67 TCCATGACG T TCCTGA  67 CGTT p68 TCCATGACGT T CCTGA  68 CGTT p69 TCCATGACGTTCC T GA  69 CGTT p70 TCCATGACGTTCCTGA  70 CG T T p71 TCCATGACGTTCCTGA  71 CGT T p72 tcgtcgttttgtcgttttgtcgt t  72 p73 TCGTCGTTTTGTCGTTT  73 TGTCGTT p74 tccatgacgttcctgatgc t  74 p75 TCCATGACGTTCCTGA  75 TGC T p76 T CGTCGTTTTGTCGTTT  76 TGTCGTT p77 TCG T CGTTTTGTCGTTT  77 TGTCGTT p78 TCGTCG T TTTGTCGTTT  78 TGTCGTT p79 TCGTCGT T TTGTCGTTT  79 TGTCGTT p80 TCGTCGTT T TGTCGTTT  80 TGTCGTT p81 TCGTCGTTT T GTCGTTT  81 TGTCGTT p82 TCGTCGTTTTG T CGTTT  82 TGTCGTT p83 TCGTCGTTTTGTCG T TT  83 TGTCGTT p84 TCGTCGTTTTGTCGT T T  84 TGTCGTT p85 TCGTCGTTTTGTCGTT T  85 TGTCGTT p86 TCGTCGTTTTGTCGTTT  86 T GTCGTT p87 TCGTCGTTTTGTCGTTT  87 TG T CGTT p88 TCGTCGTTTTGTCGTTT  88 TGTCG T T p89 tccatGACGTTCCTGACG  89 >1000 TT p90 tccatgacgtTCCTGACGTT  90  1000 p91 tccatgacgttcctgACGTT  91   49 p92 tccatGACGTTCCTGACG  92 >1000 TT p93 tccatgacgtTCCTGACGTT  93 >1000 p94 tccatgacgttcctgACGTT  94   145 p95 T C GTCGTTTTGTCGTTT  95 TGTCGTT p96 TC G TCGTTTTGTCGTTT  96 TGTCGTT p97 TCGT C GTTTTGTCGTTT  97 TGTCGTT p98 TCGTC G TTTTGTCGTTT  98 TGTCGTT p99 TCGTCGTTTT G TCGTTT  99 TGTCGTT p100 TCGTCGTTTTGT C GTTT 100 TGTCGTT p101 TCGTCGTTTTGTC G TTT 101 TGTCGTT p102 TCGTCGTTTTGTCGTTT 102 T G TCGTT p103 TCGTCGTTTTGTCGTTT 103 TGT C GTT p104 TCGTCGTTTTGTCGTTT 104 TGTC G TT p105 T CCATGACGTTCCTGA 105 CGTT p106 T C CATGACGTTCCTGA 106 CGTT p107 TC C ATGACGTTCCTGA 107 CGTT p108 TCC A TGACGTTCCTGA 108 CGTT p109 TCCA T GACGTTCCTGA 109 CGTT p110 TCCAT G ACGTTCCTGA 110 CGTT p111 TCCATG A CGTTCCTGA 111 CGTT p112 TCCATGA C GTTCCTGA 112 CGTT p113 TCCATGAC G TTCCTGA 113 CGTT p114 TCCATGACGTTCCTGA 114 CGTT p115 TCCATGACGT T CCTGA 115 CGTT p116 TCCATGACGTT C CTGA 116 CGTT p117 TCCATGACGTTC C TGA 117 CGTT p118 TCCATGACGTTCC T GA 118 CGTT p119 TCCATGACGTTCCT G A 119 CGTT p120 TCCATGACGTTCCTG A 120 CGTT p121 TCCATGACGTTCCTGA 121 C GTT p122 TCCATGACGTTCCTGA 122 C G TT p123 IR700- 123 tccatgacgttcctgacg t t p124 IR700- 124 TCCATGACGTTCCTGA CG T T p125 tcgtcgtttcgtcgttttgtcgtt 125 p126 DBCO- 126 TCGTCGTTTTGTCGTTT TGTCGTT p127 DBCO- 127 TCGTCGTTTTGTCGTTT TGTCGTT p128 TGCTGCTTTTGTGCTTT 128 TGTGC T T p129 tcattgGAAAACGTTCTTC 129 GGGGCGTTctt p130 tcattgGAAAAGCTTCTTG 130 CGGGGCTTctt p131 TCATTGGAAAACGTTC 131 TTCGGGGCGTTCTT p132 AAGAACGCCCCGAAGA 132 ACGTTTTCCAATGA p133 TCATTGGAAAACGTTC 133 TTCGGGGCGTTCTT p134 AAGAACGCCCCGAAGA 134 ACGTTTTCCAATGA p135 TCATTGGAAAACGTTC 135 TTCGGGGCGTTCTT p136 AAGAACGCCCCGAAG 136 AACGTTTTCCAATGA p137 TCATTGGAAAACGTTC 137 TTCGGGGCGTTCTT p138 AAGAACGCCCCGAAG 138 AACGTTTTCCAATGA p139 tccatGACGTTCCTGAcgtt 139 p140 TCCATGACGTTCCTGA 140 cgtt p141 tccatGACGTTCCTGACG 141 tt p142 tccatGACGTTCCTGACG 142 T T p143 tccatGACGTTCCTGACG 143 TT p144 AACGACAAAACGACAA 144 AACGACGA p145 AACGACAAAACGACAA 145 AACGACGA p146 TCGTCGTTTTGTCGTTT 146 TGTCGtT p147 TCGTCGTTTTGTCGTTT 147 TgtcgtT p148 TCGTCGTTTTGTCGTT T 148 TGTCGtT p149 TCGTCGTTTTGTCGTT T 149 TgtcgtT p150 tcgtcGTTTTGTCGTTTT 150 GTCG T T p151 tcgtcgttttgtcgttttgtcg t T 151 p152 tcgtcGTTTTGTCGTTTT 152 GTCG t T p153 tcgtcGTTTTGTCGTTTT 153 GTCG t t p154 tcgtcGTTTTGTCGTTTT 154 GTCG T t p155 TTCG T CGTTTTGTCGTT 155 TTGTCGTT p156 TTTCG T CGTTTTGTCGT 156 TTTGTCGTT p157 GTTTCG T CGTTTTGTC 157 GTTTTGTCGTT p158 GTTTCG T CGTTTTGTC 158 GTTTTGTCGTT p159 GTTTCG T CGTTTTGTC 159 GTTTTGTCGTT p160 GTTTCG T CGTTTTGTC 160 GTTTTGTCGTT p161 TCG T CGTTTTGTCGTTT 161 TGTCGTT-C3 p162 TCGTCGTTTTGTCGTT T 162 T p163

CGTCGTTTTGTCGTT 163 TTGTCG t t-C3 p164 C3- 164

CGTCGTTTTGTCGTT TTGTCG T T-C3 p165 TCG

CGTTTTGTCGTT 165 TTGTCG T T-C3 p166 C3- 166 TCG

CGTTTTGTCGTT TTGTC T T-C3 p167

CG

CGTTTTGTCGTT 167 TTGTCG T T-C3 p168 C3- 168

CG

CGTTTTGTCGTT TTGTCG T T-C3 p169

CG T CGTTTTGTCGTT 169 TTGTCGTT-C3 p170 C3- 170

CG T CGTTTTGTCGTT TTGTCGTT-C3 p171 TCGTCGTTTTGTCGTTT 171 T p172 TCG T CGTTTTGTCGTT 172 p173 TCG T CGTTTTGTCG 173 p174 TCG T CGTTTTGT 174 p175

CG T CGTTTTGTCGTT 175 TT p176

TCG T CGTTTTGTCGT 176 T p177

CG T CGTTTTGTCG 177 p178

CG T CGTTTTGT 178 p179

CG

CGTTTTGTCGTT 179 TTGTCG T T-C3 p180

CGTCGTTTTGTCGTT 180 TTGTCG T T-C3 p181

CGTCG T TTTGTCGTT 181 TTGTCGTT-C3 p182

CGTCG T TTTGTCGTT 182 TTGTCGTT-C3 p183

CG T CGTTTTGTCGTT 183 TTGTCGTT-C3 p184 TCCATGACGTTCCTGA 184 TGC T -C3 p185 tccatgacgttcctgatgc t -C3 185 p186 t ccatgacgttcctgatgct-C3 186 p187

CG T CGTTTGTCGTT- 187 C3 p188

CG T CGTTGTCGTT-C3 188 p189

CG T CGTGTCGTT-C3 189 p190

CG T CGTTCGTT-C3 190 p191

CG T CGTCGTT-C3 191 p192

GC T GCTTTTGTGCTT 192 TTGTGCTT p193 TCCATGACGTTCCTGA 193 CGT T -C3 p194 tccatgacgttcctgacgt t -C3 194 p195 T CCATGACGTTCCTGA 195 CGTT-C3 p196 t ccatgacgttcctgacgtt-C3 196 p197 T AACGACAAAACGAC 197 AAAACGACGA p198 AACGACAAAACGACA 198 AAACGACGA T -C3 p199

CG T CGttttgtCGTT-C3 199 p200

CG T CGttttgtCGTT-C3 200 p201

CG T CGttTTGTCGTT- 201 C3 p202

CG T CGTTttGTCGTT- 202 C3 p203

CG T CGTTTTgtCGTT- 203 C3 p204

CG T CGTTTTGTCGTT- 204 C3 p205

CG T CGTTTTGTCGTT- 205 C3 p206

CG T CGTTTTGTCGTT- 206 C3 p207

CG T CGTTTTGTCGTT- 207 C3 p208

CG T CGTTTTGTCGTT- 208 C3 p209

CG T CGTT-C3 209 p210

CGTCGT T -C3 210 p211

CG T TT-C3 211 p212

CGTT T -C3 212 p213

CGTCGTGTCG T T-C3 213 p214

CGTCGTGTTTT T -C3 214 p215

CGTTTTGTCGT T -C3 215 p216

CGTTTGTCGT T -C3 216 p217

CGTTGTCGT T -C3 217 p218

CGTGTCGT T -C3 218 p219

GC T GCTTTTGTGCTT- 219 C3 p220

CGTCGTTTTGTCG T T- 220 C3 p221

CGTCGTTTTGTCG T T- 221 C3 p222 GGGACGATCGTC T 222 p223 ggGACGATCGTC T gg 223 p224 ggGACGA T CGTCTgg 224 p225

CG T CGTGTCGTT-C3 225 p226

CG T CGTGTCGTT-C3 226 p227

CG T CGTGTCGTT-C3 227 p228

CG T CGTGTCGTT-C3 228 p229

CGTCGTGTCG T T-C3 229 p230

CGTCGTGTCG T T-C3 230 p231

CGTCgtgtCG T T-C3 231 p232 tcgtcgttttgtcgttttgtcgc T T- 232 C3 p233

gtcgttttgtcgttttgtcg T T- 233 C3 p235 tcgtcgttttgtcg t T-C3 235 p236

cgtcgttttgtcg t T-C3 236 p237 tcgtcgtgtcg t T-C3 237 p238

cgtcgtgtcg t T-C3 238 p239

CgtCgtgtCg T T-C3 239 p240

CgtCgtgtCg t t-C3 240 p241

Cgtcgtgtcg t t-C3 241 p242

cgtcgtgtcg t t-C3 242 p243

cgtcgtgtcg t t-C3 243 p244

Cg t cgtgtcgtt-C3 244 p245

cg t cgtgtcgtt-C3 245 p246

cg t cgtgtcgtt-C3 246 p247

Cg t cgttttgtcgttttgtcgtt- 247 C3 p248

cg t cgttttgtcgttttgtcgtt-C3 248 p249

cg t cgttttgtcgttttgtcgtt-C3  249 p250

CGTCgtgtCG T T-C3 250 p251

CG T CgtgtCgtt-C3 251 p252

Cg T CgtgtCgtt-C3 252 p253

CG′ T CgtgtCGTT-C3 253 p254

CG T CgtgtCG′TT-C3 254 p255

CG T CgtgtCGT′T-C3 255 p256

CG T CgtgtCGTT′-C3 256 p257

CG T CgtgtCGT′T′-C3 257 p258

CG T CgtgtCG′T′T′-C3 258 p259

CGT′CgtgtCG T T-C3 259 p260

CGTCgtgtCG T T′-C3 260 p261 UCGT′CgtgtCG T T′-C3 261 p262

cg

cgtgtcg t t-C3 262 p263

cg t cgtg

cgtt-C3 263 p264 T AACGACACGACGA 264 p265 AACGACACGACGA T 265 p266

cg t cgtg

cgtt-C3 266 p267 cg t cgtgtcgtt-C3 267 p268 cg t cgtgucgtt-C3 268 p269 Tcg t cgtgtcgtt-C3 269 p270 tcg t cgtgtcgtt-C3 270 p271

cgtcgtgtcgtt-C3 271 p272

cgtcgtgtcgtt-C3 272 p273

gc t gctgtgctt-C3 273 p274

cg a gctgtcgtt-C3 274 p275

cg t cgtgacgtt-C3 275 p276

cg a cgtgacgtt-C3 276 p277 acg a cgtgacgtt-C3 277 p278 acgacgtgacg t t-C3 278 p279

cngt cgtgtcgtt-C3 279 p280

cg t cngtgtcgtt-C3 280 XXXXXX p281

cg t cgtgtcngtt-C3 281 p282

cngtcngtgtcngtt-C3 282 p283 acnga cngtgacngtt-C3 283 p284 acngacngtgacngt t-C3 284 p285

cg t cgtgtcgtT-OH 285 p286

cgtcgtgtcgtt-C3 286 p287

cgtcgtgtcgtT 287 p288

cg t cgtgtcgtt-C3 288 p289

cg t cgtgtcgtT 289 p290 tcgtcgtgtcgtt-C3 290 p291 tcgtcgtgtcgtT 291 p292

cgtcgtgacgt t -C3 292 p293

cgacgtgacgt t -C3 293 p294 tccatg

cgttccttgat t -C3 294 p295 tccatg

cgttcctt t -C3 295 p296 tccatg

cgttct t -C3 296 p297 tccatg

cgt t -C3 297 p298 t

cg t cgtgtcgtt-C3 298 p299

cg t cgtgtcgtt-C3 299 p300 u

cg t cgtgtcgtt-C3 300 p301 tcg

cgtgtcg t t-C3 301 p302 tcg

cgtgtcg t t-C3 302 p303 tcg

cg t gtcgtt-C3 303 p304

cgtcgtgacg t t-C3 304 p305

cgacgtgacg t t-C3 305 p306 C3-PO-

cg t cgtgtcgtt-C3 306 p307 fucg t cgtgtcgtt-C3 307 p308 bucg t cgtgtcgtt-C3 308 p309 C3-PS-

cg t cgtgtcgtt-C3 309 p310

cgtcgtgtcg tt-C3 310 p311 ucg t cgtgtcgtt-C3 311 p312 tcgucgtgtcg t t-C3 312 p313 t

cg t cgtgacgtt-C3 313 p314 u

cg t cgtgacgtt-C3 314 p315 NH₂C6-

cg t cgtgacgtt-C3 315 p316 C3-u

cg t cgtgacgtt-C3 316 p317 tcg a cgtg

cgtt-C3 317 p318 tcg a cgtgacgtt-C3 318 p319

cg a cgtg

cgtt-C3 319 p320

cg t ccatgacgtt-C3 320 p321

cg t ccatg

cgtt-C3 321 p322 tcg t ccatg

cgtt-C3 322 p323 bucg t cgtgacgtt-C3 323 p324 catg

cgttcctt t -C3 324 p325 tg

cgttcctt t -C3 325 p326 tatg

cgttcctt t -C3 326 p327 tccatgacgttcctt t -C3 327 p328

gc t gctgagctt-C3 328 p329

gc a gctgagctt-C3 329 p330 fTcg t cgtgtcgtt-C3 330 p331 ftcg t cgtgtcgtt-C3 331 p332

cg t cgtgtcgtt-C3 332 p333

cg t cgtgtcgtt-C3 333 p334

cg t cgtgtcgtt-C3 334 p335

cg t cgtgtcgtt-C3 335 p336

cg t cgtgtcgtt-C3 336 p337

cg t cgtgtcgtt-C3 337 p338 tatg

gcttcctt t -C3 338 p339 bucg t cgptgtcgptt-C3 339 p340 bucg t cgtgptcgtpt-c3 340 p341 bucg t cgtgtcgtpt-C3 341 p342 bucg t cgtgptcgtt-C3 342 p343 bucg t cgptgtcgtt-C3 343 p344 bucg t cgtgtcgptpt-C3 344 p345 t

gc t gctgagctt-C3 345 p346 t

gc t gctgagctt-C3 346 p347 t

gctgctgagctt-C3 347 p348

cg t cgtgtcgtt-C3 348 p349

cg t cgtgtcgtt-C3 349 p350

cg t cgtgtcgtt-C3 350 p351

cg t cgtgtcgtt-C3 351 p352

cg t cgtgtcgtt-C3 352 p353 t

cgtcgtgacgtt-C3 353 p354 t

gctgctgagctt-C3 354 p355

cg T cgtgtcgTt-C3 355 p356

cg T cgtgtcgtt-C3 356 p357

cg T cgtgtcgTt-C3 357 p358

cgtcgtgtcg t t-C3 358 p359

cgTcgtgtcg t t-C3 359 p360

cgtcgtgtcg T t-C3 360 p361

cg T cgtgtcgtt-C3 361   102 p362

cg T cgtgtcg Tet-C3 362   175 p363

cg T cgtgtcGett-C3 363   365 p364

cg T cgtgtCegtt-C3 364   523 p365

cg T cgtgTecgtt-C3 365   260 p366

cg T cgtGetcgtt-C3 366   390 p367

cg T cgTegtcgtt-C3 367   287 p368

cg T cGetgtcgtt-C3 368   223 p369

cg T Cegtgtcgtt-C3 369   242 p370

cGe T cgtgtcgtt-C3 370   158 p371

Ceg T cgtgtcgtt-C3 371   160 p372

cgTecgtgtcg T t-C3 372   194 p373 t

cgtcgtgacgttX5-C3 373 p374 t

cgtcgtgacgtX5t-C3 374 p375 t

cgtcgtgacgX5tt-C3 375 p376 t

cgtcgtgacX5gtt-C3 376 p377 t

cgtcgtgaX5cgtt-C3 377 p378 t

cgtcgtgX5acgtt-C3 378 p379 t

cgtcgtX5gacgtt-C3 379 p380 t

cgtcgX5tgacgtt-C3 380 p381 t

cgtcX5gtgacgtt-C3 381 p382 t

cgtX5cgtgacgtt-C3 382 p383 t

cgX5tcgtgacgtt-C3 383 p384 t

cX5gtcgtgacgtt-C3 384 p385 t

X5cgtcgtgacgtt-C3 385 p386 tX5

cgtcgtgacgtt-C3 386 p387 X5t

cgtcgtgacgtt-C3 387 p388 tucgx5cgtgacgtt-C3 388 p389 tucgx5cgtgacgtt-C3 389 p390

cg T cgtgtcgtt-C3 390   533 p391

Ceg T cgtgtcgtt-C3 391  1080 p392

CeGe T cgtgtcgtt-C3 392  1691 p393

cg T cgtgtCeGeTeTe-C3 393  2211 p394

CeGe T cgtgtCeGeTeT 394 inact. e-C3 p395

CeGe T CeGeTeGeTe 395 CeGeTeTe-C3 p396

Ceg T CegtgtCegtt-C3 396   704 p397

cg T cGetGetcGett-C3 397  3494 p398

cg T cgTegTecgTet-C3 398  2423 p399

Ceg T cgTegTecgTet-C3 399  4261 p400

cgTecgTegTecg T t-C3 400  1805 p401

CegTecgTegTecg T t-C3 401  2509 p402

Ceg T cgtgtcGett-C3 402   356 p403

Ceg T cgtgtCegtt-C3 403   482 p404

Ceg T cgttgtcgTet-C3 404   203 p405

Ceg T cgtTegtcgTet-C3 405   809 p406

Ceg T cgTetgtcg Tet-C3 406   510 p407

Ceg T cgtX3gtcgTet-C3 407   286 p408

Ceg T cgX3tgtcgTet-C3 408   266 p409

Ceg T cgtTegtcgTet-C3 409   875 p410

Ceg T cgtX3gtcgTet-C3 410   193 p411 X3

c T cgtgtcgtt-C3 411   124 p412

X3cg T cgtgtcgtt-C3 412 inact. p413

cX3g T cgtgtcgtt-C3 413   225 p414

cgX3 T cgtgtcgtt-C3 414   131 p415

cg T X3cgtgtcgtt-C3 415   124 p416

cg T cX3gtgtcgtt-C3 416    85 p417

cg T cgX3tgtcgtt-C3 417    92 p418

cg T cgtX3gtcgtt-C3 418    93 p419

cg T cgtgX3tcgtt-C3 419   189 p420

cg T cgtgtX3cgtt-C3 420   227 p421

cg T cgtgtcX3gtt-C3 421    95 p422

cg T cgtgtcgX3tt-C3 422   135 p423

cg T cgtgtcgtX3t-C3 423   202 p424

cg T cgtgtcgttX3-C3 424   113 p425 bucg T cgtgtcgtt-C3 425 p426

cg T cgtgtcgtt-C3 426 p427

cg T cgtgtcgtt-C3 427 p428

cg T cgtgtcgtt-C3 428 p429 od

cg T cgtgtcgtt-c3 429 p430 o

cg T cgtgtcgtt-c3 430 p431 ods

cg T cgtgtcgtt-c3 431 p432 s

cg T cgtgtcgtt-c3 432 p433 bu^(r)cg T cgtgtcgtt-C3 433    96 p434 bu^(s)cg T cgtgtcgtt-C3 434   125 p435 buc^(r)g T cgtgtcgtt-C3 435   148 p436 buc^(s)g T cgtgtcgtt-C3 436   112 p437 bu^(s)c^(r)g T cgtgtcgtt-C3 437 p438 bu^(s)c^(s)g T cgtgtcgtt-C3 438 p439 buCegTcgtgtcgtt-C3 439 p440 buCegTcgtgtCegtt-C3 440 p441 buCegTCegtgtCegtt-C3 441 p442 buCegTcgtgtcgTet-C3 442 p443 buCegTcgTegtcgTet-C3 443 p444 Biotin- 444 AfAfCfGfAfCfAfCfGfAfCf GfAf p445 buCsigTcgtgtcgtt-c3 445 p446 bucgTcgtgtcgTsit-c3 446 p447 buCsigTCsigtgtCsigtt-c3 447 p448 buCsigTcgtgtcgTsit-c3 448 p449 buCsigTcgTsigtcgTsit-c3 449 p450 t

cgtcgtgacgtt-c3 450 p451 t

cgacgtgacgtt-c3 451    60  18 100 p452 t

cgacgtt-c3 452 inact. 100 inact. p453 t

acgtt-c3 453 inact. inact. inact. p454 tacgtt-c3 454 inact. inact. inact. p455 t

cgtt-c3 455 inact. inact. inact. p456 tacgt-c3 456 inact. inact. inact. p457 t

cgt-c3 457 inact. inact. inact. p458 t

cg

cgtgacgtt-c3 458  36 119 p459 t

cg

cgtt-c3 459 132 inact. p460 t

acg

t-c3 460 inact. inact. p461 tacg

t-c3 461 inact. inact. p462 tucg

t-c3 462 223 inact. p463 g

cgtt-c3 463 inact. inact. p464 gacgtt-c3 464 inact. inact. p465 g

cg

t-c3 465 inact. inact. p466 gacg

t-c3 466 inact. inact. p469 tbucg t cgtgacgtt-c3 469 p470 bucg T cgtgtcg-c3 470 p471 bucg T cgtgt-c3 471 p472 bucgtcgtg T -c3 472 p473 bucg T cgt-c3 473 p474 bucgtcg T -c3 474 p475 bucg T t-c3 475 p476 bucgt T -c3 476 p477 t

cg t cgtgacgtmtm-c3 477 p478 tmtm

cg t cgtgacgtt-c3 478 p479 tmtm

cg t cgtgacgtmtm-c3 479 p480 t

cg t cgtgacgt(m)t(m)-c3 480 p481 t(m)t(m)

cg t cgtgacgtt-c3 481 p482 t

c^(r)g t cgtgacgtt-c3 482   399 p483 t

c^(s)g t cgtgacgtt-c3 483   577 p484 t

^(r)cg t cgtgacgtt-c3 484   410 p485 t

^(s)cg t cgtgacgtt-c3 485   245 p486 t(m)t(m)

cg t cgtgacgt(m)t 486 (m)-c3 p487 bucgtcgtgtcgtt(m)-c3 487 p488 bucgtcgtgtcgt(m)t(m)-c3 488 p489 bucgtcgtgtcgt(m)T-c3 489 In table 2, column A provides IL-6 expression in DB cells (EC₅₀, nM); column B provides IL-10 expression in DB cells (EC₅₀, nM); column C provides NFκB activation in Ramos blue cells (EC₅₀, nM); column D provides NFκB activation Hela-hTLR9-NFκB-luc cells (EC₅₀, nM); column E provides NFκB activation Hela-mTLR9-NFκB-luc cells (EC₅₀, nM); column F provides IL-6 secretion in mouse splenocytes (EC₅₀, nM); column G provides IL-6 secretion in mouse splenocytes after 24 h preincubation in 95% mouse plasma (EC₅₀, nM); column H provides IL-6 secretion in mouse bone marrow differentiated DC (EC₅₀, nM); Column I provides NFκB activation in mouse HEK-Blue cells after 2 h transfection with RNAiMax (EC₅₀, nM); and Column J provides NFκB activation in human HEK-Blue cells after 2h transfection with RNAiMax (EC₅₀, nM). The key descriptors for the sequences provided throughout the Tables included herein are as follows: lower case = nucleoside-3′-phosphorothioate; UPPER CASE = ucleoside-3′-phosphate; italics lower case = nucleoside having a 3′tBuDS-Ph(ortho)triester (PS); ITALICS UPPER CASE = nucleoside having a 3′tBuDS-Ph(ortho)triester (PO); dt = dT(DBC0); bold double underlined t = DBCO-C6-dT; bold lower case = nucleoside having a 3′n-butyl triester (PS); BOLD UPPER CASE = nucleoside having a 3′n-butyl triester (PO); italic bold lower case = nucleoside having a 3′homopropargyl triester (hPro) (PS); italic underlined lower case = nucleoside having a 3′DBCO-NH-PEG2 triester (N1) (PS); ITALIC UNDERLINED UPPER CASE = nucleoside having a 3′DBCO-NH-PEG2 triester (N1) (PO); double underlined t = dT PEG2-NH₂ triester (PS); double underlined T = dT PEG2-NH₂ triester (PO); italic double underlined lower case = nucleoside having a 3′PEG2-NH₂ triester (N1)(PS); ITALIC DOUBLE UNDERLINED UPPER CASE = nucleoside having a 3′PEG2-NH₂ triester (N1) (P0); BOLD ITALIC UNDERLINED UPPER CASE U = 5-iodo-2′-deoxyuridine (PO); bold italic underlined lower case u = 5-iodo-2′-deoxyuridine (PS); BOLD UNDERLINED = 2′-fluoronucleotide (PO); an apostrophe indicates that the nucleotide identified by a letter to the left of the apostrophe contains a 2′-OMe-modified ribose; underlined ng = 7-deaza-2′-deoxyguanosine (PS); underlined pT = PEG4 dT triester (PO); underlined pt = PEG4 dT triester (PS); fT = 5-trifluoromethyl-thymidine (PO); fU = 5-fluoro-2′-deoxyuridine (PO); bU = 5-bromo-2′-deoxyuridine (PO); ft = 5-trifluoromethyl-thymidine (PS); fu = 5-fluoro-2′-deoxyuridine (PS); bu = 5-bromo-2′-deoxyuridine (PS); C3 = C3 spacer (-(CH{hd 2)₃-OH)(PO); c3 = C3 spacer (-(CH₂)₃-OH) (PS); C6 = hexane-1,6-diy1; NH₂C₆ = 6-aminohex-1-yl; Te = thymidine having a 3′ethyl triester (PO); Ge = guanosine having a 3′ethyl triester (PO); Ce = cytidine having a 3′ethyl triester (PO); Ue = 5-iodouridine having a 3′ethyl triester (PO); ue = 5-iodouridine having a 3′ethyl triester (PS); iu = 5′- 5′ cap based on 5-iodo-2′-deoxyuridine (PS); iU = 5′- 5′ cap based on 5-iodo-2′-deoxyuridine (PO); X5 = X5-DBCO (PO); x5 = x5-DBCO (PS); X3 = X3 abasic spacer (PO); and IR700 is a dye. Here, the descriptor (PO) stands for 3′-phosphate; and (PS) stands for 3′-phosphorothioate; od = 5′-orthodisulfide phosphodiester; o = 5′-phosphate (PO); ods = 5′-orthodisulfide phosphorothioate; s = 5′-phosphorothioate (PS); superscript “r“ = Rp PS; superscript “s“ = Sp PS; Af = 2′-fluoro-adenosine (PO); Csi = dC O-silyltriester (PO); Tsi = dT O-silyltriester (PO); tm = 2′-OMe thymidine (PS); t(m) = 2′-OMOE thymidine (PS). Structures are shown in FIGs. 1A and 1B. Double-Stranded CpGs: Annealing and Gel Analysis:

Polynucleotide p88 (1 mL, 5 mM stock) was added to p144 (3.3 mL, 2 mM stock) with DPBS (24.7 mL). Polynucleotide p88 was treated with p145 in a similar manner. The mixtures were heated to 65° C. for 10 min. Analysis by TBE urea gel showed complete annealing of the p88 (see FIG. 2). 1 μL of each sample was removed, added to 5 μL of formamide loading buffer, and loaded per well onto a 15% TBE-urea gel, 200 volts for 40 min followed by ethidium bromide (EtBr) staining. See Table 2 for structures of p88, p144, and p145.

Double stranded-CpG using p88/p144 - Representative example (1): (SEQ ID NO: 234) TCGTCGTTTTGTCGTTTTGTCG T T AGCAGCAAAACAGCAAAACAGCAA Double stranded-CpG using p88/p145 - Representative example (2): (SEQ ID NO: 467) TCGTCGTTTTGTCGTTTTGTCG T T AGCAGCAAAACAGCAAAACAGCAA

Example 2: Preparation of the Exemplary Conjugates of the Invention

In the below preparation the following antibodies have been used: anti-CD38 antibody is Ab79 disclosed in WO 2012/092616, the disclosure of this antibody is incorporated herein by reference in its entirety; anti-CD79b antibody is huMA79bv28 disclosed in WO 2014/011521, the disclosure of this antibody is incorporated herein by reference in its entirety; anti-CD30 antibody is brentuximab; anti-CD22 antibody is 10F4 disclosed in US 20140127197, the disclosure of this antibody is incorporated herein by reference in its entirety; and anti-CD20 antibody is rituximab.

Other antibodies may be incorporated in the conjugates described herein, e.g., anti-DEC205 antibody can be an antibody disclosed in US 2010/0098704 (e.g., with light chain having the sequence:

EIVLTQSPAT LSLSPGERAT LSCRASQSVS SYLAWYQQKP GQAPRLLIYD ASNRATGIPA RFSGSGSGTD FTLTISSLEP EDFAVYYCQQ RRNWPLTFGG GTKVEIKRTV AAPSVFIFPP SDEQLKSGTA SVVCLLNNFY PREAKVQWKV DNALQSGNSQ ESVTEQDSKD STYSLSSTLT LSKADYEKHK VYACEVTHQG LSSPVTKSFN RGEC (SEQ ID NO: 468); and the heavy chain having the sequence: QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMYWVRQAPGKGLEWVAVIWYDGSNKYYADSVKGR FTISRDNSKNTLYLQMNSLRAEDTAVYYCARDLWGWYFDYWGQGTLVTVSSASTKGPSVFPLAPSSKST SGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHK PSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKF NWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPR EPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGLLQGG) (SEQ ID NO: 490); anti-CD303 antibody can have a light chain sequence DIQLTQSPSSLSASVGDRVTITCKASQSVDYDGDSYMWYQQKPGKAPKLLIYAASTLESGVPS RFSGSGSGTDFTLTISSLQPEDFATYYCQQANEDPRTFGQGTKVEIKRTVAAPSVFIFPPSDE QLKSGTASWCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKAAYE KHKVYACEVTHQGLSSPVTKSFNRGEC (SEQ ID NO: 491), and a heavy chain sequence: DVQLVESGGGLVKPGGSLRLSCAASGFTFSTYTMSWVRQAPGKGLEWVATISPGDSFGYYYPDSVQGR FTISRDNAKNSLYLQMNSLRAEDTAVYYCTRDIYYNYGAWFAYWGQGTLVTVSSASTKGPSVFPLAPSS KSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNV NHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCWVDVSHEDPE VKFNWYVDGVEVHNAKTKPREEQYNSTYRWSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQ PREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTV DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGLLQGG (SEQ ID NO: 492); anti-CD40 antibody can be lucatumumab or dacetuzumab; anti-CD74 antibody can be milatuzumab; anti-CD304 antibody can be vesencumab; and anti-CD38 antibody can be daratumumab, SAR650984 (Sanofi-Immunogen), or MOR202 (Morphosys-Celgene). These antibodies can include a Q-tag (e.g., LLQGG (SEQ ID NO: 493) within the heavy chain or GGGLLQGG (SEQ ID NO: 494) within the light chain).

Other antibodies may be incorporated in the conjugates described herein, e.g.: anti-PD-L1 antibody can be antibody described in mAbs (2016), 8, 593 and U.S. Pat. No. 8,217,149 with light chain having the sequence: DIQMTQSPSSLSASVGDRVTITCRASQDVSTAVAWYQQKPGKAPKLLIYSASFLYSGVP SRFSGSGSGTDFTLTISSLQPEDFATYYCQQYLYHPATFGQGTKVEIKADAAPTVSIFPPSSEQLTSGGAS VVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKT STSPIVKSFNRNEC (SEQ ID NO: 495), and the heavy chain sequence: EVQLVESGGGLVQPGGSLRLSCAASGFTFSDSWIHWVRQAPGKGLEWVAWISPYGGSTYYADSVKGRF TISADTSKNTAYLQMNSLRAEDTAVYYCARRHWPGGFDYWGQGTLVTVSSAKTTAPSVYPLAPVCGDTT GSSVTLGCLVKGYFPEPVTLTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVTSSTWPSQSITCNVAHPAS STKVDKKIEPRGPTIKPCPPCKCPAPNLLGGPSVFIFPPKIKDVLMISLSPIVTCVVVAVSEDDPDVQISWFV NNVEVHTAQTQTHREDYASTLRVVSALPIQHQDWMSGKEFKCKVNNKDLPAPIERTISKPKGSVRAPQV YVLPPPEEEMTKKQVTLTCMVTDFMPEDIYVEWTNNGKTELNYKNTEPVLDSDGSYFMYSKLRVEKKNW VERNSYSCSVVHEGLHNHHTTKSFSRTPGLLQGG (SEQ ID NO: 496)

A. General Procedure for Conjugation to Q-Tagged Antibody Mediated by Microbial Transglutaminase (mTG)

TABLE 3 Exemplary Setup of Transglutaminase-mediated Conjugation Conc. Volume Antibody Molecule (μM) (μL) Linker:Ab Ab:mTG (nmol) Q-tagged anti- 99 253 — — 25 CD22 antibody N₃-PEG23-NH₂ 100000 25 100.0 — — mTG 20 125 — 10.0 — Tris buffer, — 97 — — — pH 8.5 Final volume — 500 — — — General conditions for enzymatic conjugation: Final antibody concentration = 50 μM Antibody:Transglutaminase (mTG) ratio: 10:1 Linker:Ab ratio: 100:1 mTG MW = 38 kDa, 100 mU/mg, ε₂₈₀ = 71850 M⁻¹ cm⁻¹ 2% w/v = 20 mg/mL = 5 μM in tris buffer Tris buffer: 25 mM Tris, 150 mM NaCl, pH 8.5 Linker solution in tris buffer or DMSO DMSO ≤ 5% v/v of final volume

General Protocol:

To a solution of a Q-tagged antibody (e.g., Q-tagged anti-CD22 antibody or Q-tagged anti-CD38 antibody, designated as CD22-Q and CD38-Q, respectively) in tris buffer was added sequentially azido amino linker and mTG. The mixture was warmed to 37° C. for 2 h, at which time, the excess linker and mTG were removed by buffer exchanging the antibody with the pendent azido-linker (Ab-N₃) through an Amicon 30 kD spin concentrator using DPBS as an eluent. A sample of Ab-N₃ was then reduced and characterized for degree of linker conjugation by RP-HPLC, as described below. Subsequent Huisgen cycloaddition of an alkyne in a phosphotriester of the CpG polynucleotide with azido in Ab-N₃ furnished an exemplary conjugate of the invention (see FIGS. 3A and 3B).

B. General Procedure for Conjugation to an Antibody Through the Use of Activated Carboxylic Acid Esters (e.g., TFP or PFP)

TABLE 4 Exemplary Setup for Antigen-binding Moiety (e.g., Antibody) Conjugation with TFP-ester- or PFP-ester-capped azido-PEG Conc. Volume Antibody Molecule (μM) (μL) Linker:Ab (nmol) LC-containing 167 1700 — 28 antigen-binding moiety (e.g., rituximab) TFP-PEGn-N₃ or 100000 8.5 3.0 — PFP-PEGn-N₃ n = 3, 7, 11, 24, or 35 DPBS — 291 — — Final volume — 2000 — —

General Protocol:

To a solution of an antibody in DPBS buffer, was added azido-PEG24-PFP, and the resulting mixture was left overnight at room temperature, at which time, the excess azido-PEG24-PFP was removed by buffer exchanging the produced Ab-N₃ through an Amicon 30 kD spin concentrator using DPBS as an eluent. A sample of Ab-N₃ was then reduced and characterized for degree of linker conjugation by RP-HPLC, as described below. Subsequent Huisgen cycloaddition of an alkyne in a phosphotriester of the CpG polynucleotide with azido in Ab-N₃ furnished an exemplary conjugate of the invention.

Antibody/Double-Stranded Immunomodulating Polynucleotide Conjugation Protocol

The fully annealed double stranded CpG polynucleotides (p88/p144 and p88/p145) were added to anti-CD38Q-N₃ antibody (39 mL, 40 mM). The mixture was heated to 37° C. for 2 h and purified by chromatography on an anion exchange resin (AEX). Two major peaks were collected, concentrated through an Amicon 30 kD concentrator, and analyzed by tri-glycine denaturing gel, 200 volts for 1 h followed by ethidium bromide staining (see FIG. 4A).

Anti-CD20 Antibody Immunomodulating Polynucleotide Conjugate

A conjugate containing rituximab conjugated through TFP-PEG₂₄-N₃ linker to an immunostimulating polynucleotide (p19), where the TFP portion was linked to rituximab and azide was linked to the immunostimulating polynucleotide. The crude mixture of the conjugate was purified by AEX-HPLC under the following conditions:

-   -   Buffer A: 20 mM sodium phosphate, 15% iPrOH (aq.)     -   Buffer B: 20 mM sodium phosphate, 1M sodium bromide, 15% iPrOH         (aq.)     -   Column: Thermo Scientific Dionex DNASwift, 5×150 mm     -   10-95% buffer B in 10 min, then wash and re-equilibrate     -   Gradient: 10-95% B in 10 minutes, wash 5 min 95% B

The AEX-HPLC trace of the crude mixture is shown in FIG. 4B (the peak areas for peaks 1, 2, and 3 are 28%, 40%, and 32%, respectively, of the total area of peaks 1, 2, and 3). FIG. 4C shows the combined HPLC traces for the crude mixture and the isolated peaks identified by numbers 1, 2, and 3 in FIG. 4B. FIG. 4D provides comparison of rituximab-PEG₂₄-N₃, the crude reaction mixture, and isolated peaks 1, 2, and 3. Rituximab-p19-DAR1 (drug-antibody ratio=1, i.e., there is one antibody conjugated to one p19 polynucleotide) was identified by its molecular weight (MW=155400).

The conjugation procedures described herein have been used to prepare exemplary conjugates of the invention listed in Table 6.

Quantitation of Unconjugated and Conjugated Heavy Chain by RP-HPLC

Ab-N₃ samples were analyzed prior to Huisgen cycloaddition to assess the conjugation efficiency for the azido linker. First, reduction of Ab-N₃ (5 μM) with DTT (20 mM DTT) and 5 M guanidine-HCl was carried out at 65° C. for 30 min. The resulting proteinaceous products were analyzed by RP-HPLC under the following conditions:

-   -   Column: Pursuit Diphenyl 5, 4.6×250 mm, 5 μm     -   Column Temp: 60° C.     -   MPA: 0.1% TFA in water, MPB: 0.1% TFA in acetonitrile     -   Gradient: 35-50% MPB in 17 minutes     -   Detection at 280 nm

The percentages of unconjugated heavy chains and conjugated heavy chains (HC-N₃) are provided in Table 5 and are based on the percentages of the total of peak areas for conjugated and unconjugated heavy chains.

TABLE 5 Quantitation of the Extent of Conjugation of Antibody HC Reaction % unconjugated HC % HC—N₃ Q-tagged anti-CD79b + 13 86 N₃-PEG23-NH₂ Q-tagged anti-CD38 + 24 76 N₃-PEG23-NH₂ Q-tagged anti-CD22 + 23 77 N₃-PEG23-NH₂ (overnight, at RT) Q-tagged anti-CD22 + 23 77 N₃-PEG23-NH₂ (overnight, at RT + 3 h, at 37° C.) Conjugates Having Polynucleotide Phosphate Backbone can Elute Faster Through Anion Exchange Column than Conjugates Having Phosphorothioate Backbone

Conjugates containing Q-tagged anti-CD38 antibody conjugated to a CpG polynucleotide were prepared as described herein. In this experiment, the CpG polynucleotides used in the synthesis were p19, p21, and p88. The isolated conjugates were subjected to AEX-HPLC analysis under the following conditions:

Method A: 10-95% B in 10 min, then wash & re-equilibrate

Method B: 10-50% B in 10 min, then wash & re-equilibrate

Column: Thermo Scientific Dionex DNASwift, analytical 5×150 mm

Buffer A: 20 mM sodium phosphate, 15% iPrOH (aq.)

Buffer B: 20 mM sodium phosphate, 1 M sodium bromide, 15% i-PrOH (aq.)

The retention times for the peaks corresponding to SB-037 (anti-CD38Q-p19) conjugate in the AEX-HPLC trace were greater than those corresponding to SB-038 (anti-CD38Q-p21).

TABLE 6-A Conjugate Ab- Compound Antibody Conjugation Complementary Se- # (Ab) Site Reactive Group quence Conjugating Group A B C D E F SB-001 CD22 HC—Q-tag NH₂—PEG8—N₃ p4 5′-DBCO—TEG 4 SB-003 CD22 HC—Q-tag NH₂—PEG8—N₃ p5 5′-DBCO—TEG— 20 C6—SS—C6 SB-004 CD38 HC—Q-tag NH₂—PEG8—N₃ p4 5′-DBCO—TEG 10 20 >10      SB-005 CD38 HC—Q-tag NH₂—PEG8—N₃ p5 5′-DBCO—TEG— 100 C6—SS—C6 SB-006 CD79b HC—Q-tag NH₂—PEG8—N₃ p4 5′-DBCO—TEG SB-007 CD79b HC—Q-tag NH₂—PEG8—N₃ p5 5′-DBCO—TEG— C6—SS—C6 SB-008 CD38 HC—Q-tag NH₂—PEG8—N₃ p7 5′-DBCO—TEG— 26 20 >10      C6—SS—C6 SB-009 CD38 HC—Q-tag NH₂—PEG8—N₃ p9 5′-DBCO—TEG— >200 C6—SS—C6 SB-010 CD38 HC—Q-tag NH₂—PEG8—N₃ p12 5′-DBCO—TEG— C6—SS—C6 SB-011 CD38 HC—Q-tag NH₂—PEG8—N₃ p13 5′-DBCO—TEG— 75 40 C6—SS—C6 SB-012 CD38 HC—Q-tag NH₂—PEG23—N₃ p24 dT(DBCO) 20 SB-013 CD38 HC—Q-tag NH₂—PEG23—N₃ p25 dT(DBCO) 100 SB-014 CD38 HC—Q-tag NH₂—PEG23—N₃ p26 dT(DBCO) >200 SB-015 CD38 HC—Q-tag NH₂—PEG23—N₃ p27 dT(DBCO) >200 SB-016 CD38 HC—Q-tag NH₂—PEG23—N₃ p28 dT(DBCO) 50 SB-017 rituximab LC—TFP-tag TFP—PEG24—N₃ p7 5′-DBCO—TEG— >200 >200 C6—SS—C6 SB-018 rituximab LC—TFP-tag TFP—PEG24—N₃ p13 5′-DBCO—TEG— >200 >200 C6—SS—C6 SB-019 rituximab LC—TFP-tag TFP—PEG24—N₃ p17 5′-DBCO—TEG SB-020 rituximab LC—TFP-tag TFP—PEG24—N₃ p21 5′-DBCO—TEG SB-021 rituximab LC—TFP-tag TFP—PEG24—N₃ p4 5′-DBCO—TEG >200 SB-02-1 CD22 HC—Q-tag NH₂—PEG8—N₃ p4 5′-DBCO—TEG >10 >10      SB-022 rituximab LC—TFP-tag TFP—PEG24—N₃ p5 5′-DBCO—TEG— >200 >200 C6—SS—C6 SB-02-2 CD22 HC—Q-tag NH₂—PEG8—N₃ p4 5′-DBCO—TEG >10 >10      SB-023 rituximab LC—TFP-tag TFP—PEG24—N₃ p9 5′-DBCO—TEG— C6—SS—C6 SB-024 rituximab LC—TFP-tag TFP—PEG24—N₃ p12 5′-DBCO—TEG— C6—SS—C6 SB-025 rituximab LC—TFP-tag TFP—PEG24—N₃ p16 5′-DBCO—TEG SB-026 rituximab LC—TFP-tag TFP—PEG24—N₃ p19 5′-DBCO—TEG SB-027 rituximab LC—TFP-tag TFP—PEG24—N₃ p30 5′-DBCO—TEG SB-028 rituximab LC—TFP-tag TFP—PEG24—N₃ p32 5′-DBCO—TEG SB-029 rituximab LC—TFP-tag TFP—PEG24—N₃ p34 5′-DBCO—TEG SB-030 rituximab LC—TFP-tag TFP—PEG24—N₃ p36 5′-DBCO—TEG >200 SB-031 rituximab LC—TFP-tag TFP—PEG24—N₃ p38 5′-DBCO—TEG SB-032 CD79b HC—Q-tag NH₂—PEG23—N₃ p4 5′-DBCO—TEG SB-033 CD79b HC—Q-tag NH₂—PEG23—N₃ p19 5′-DBCO—TEG SB-034 CD79b HC—Q-tag NH₂—PEG23—N₃ p30 5′-DBCO—TEG SB-035 CD79b HC—Q-tag NH₂—PEG23—N₃ p32 5′-DBCO—TEG SB-036 CD79b HC—Q-tag NH₂—PEG23—N₃ p34 5′-DBCO—TEG SB-037 CD38 HC—Q-tag NH₂—PEG23—N₃ p19 5′-DBCO—TEG >100 SB-038 CD38 HC—Q-tag NH₂—PEG23—N₃ p21 5′-DBCO—TEG 70 SB-039 CD38 HC—Q-tag NH₂—PEG23—N₃ p23 5′-DBCO—TEG 18 SB-040 CD38 HC—Q-tag NH₂—PEG23—N₃ p30 5′-DBCO—TEG 12 SB-041 CD38 HC—Q-tag NH₂—PEG23—N₃ p34 5′-DBCO—TEG 20 SB-042 CD38 HC—Q-tag NH₂—PEG23—N₃ p38 5′-DBCO—TEG SB-043 CD38 HC—Q-tag NH₂—PEG23—N₃ p71 3′- DBCO—NH—PEG2 triester SB-044 rituximab LC—TFP- TFP—PEG24—N₃ p71 3′-DBCO—NH—PEG2 >100 tag triester SB-045 CD38 HC—Q-tag NH₂—PEG23—N₃ p76 DBCO—NH—PEG2 >10      triester SB-046 CD38 HC—Q-tag NH₂—PEG23—N₃ p77 DBCO—NH—PEG2 0.1  0.2 triester SB-047 CD38 HC—Q-tag NH₂—PEG23—N₃ p78 DBCO—NH—PEG2 0.05 triester SB-048 CD38 HC—Q-tag NH₂—PEG23—N₃ p79 DBCO—NH—PEG2 0.6  triester SB-049 CD38 HC—Q-tag NH₂—PEG23—N₃ p80 DBCO—NH—PEG2 0.04 triester SB-050 CD38 HC—Q-tag NH₂—PEG23—N₃ p81 DBCO—NH—PEG2 0.1  triester SB-051 CD38 HC—Q-tag NH₂—PEG23—N₃ p82 DBCO—NH—PEG2 0.09 triester SB-052 CD38 HC—Q-tag NH₂—PEG23—N₃ p83 DBCO—NH—PEG2 0.4  triester SB-053 CD38 HC—Q-tag NH₂—PEG23—N₃ p84 DBCO—NH—PEG2 0.1  0.3 triester SB-054 CD38 HC—Q-tag NH₂—PEG23—N₃ p85 DBCO—NH—PEG2 0.09 triester SB-055 CD38 HC—Q-tag NH₂—PEG23—N₃ p86 DBCO—NH—PEG2 0.1  triester SB-056 CD38 HC—Q-tag NH₂—PEG23—N₃ p87 DBCO—NH—PEG2 0.05 triester SB-057 CD38 HC—Q-tag NH₂—PEG23—N₃ p88 DBCO—NH—PEG2 0.1  0.3 triester SB-058 rituximab LC—TFP- TFP—PEG24—N₃ p76 DBCO—NH—PEG2 tag triester SB-059 rituximab LC—TFP- TFP—PEG24—N₃ p77 DBCO—NH—PEG2 tag triester SB-060 rituximab LC—TFP- TFP—PEG24—N₃ p78 DBCO—NH—PEG2 tag triester SB-061 rituximab LC—TFP- TFP—PEG24—N₃ p79 DBCO—NH—PEG2 tag triester SB-062 rituximab LC—TFP- TFP—PEG24—N₃ p80 DBCO—NH—PEG2 tag triester SB-063 rituximab LC—TFP- TFP—PEG24—N₃ p81 DBCO—NH—PEG2 tag triester SB-064 rituximab LC—TFP- TFP—PEG24—N₃ p82 DBCO—NH—PEG2 tag triester SB-065 rituximab LC—TFP- TFP—PEG24—N₃ p83 DBCO—NH—PEG2 2.4  tag triester SB-066 rituximab LC—TFP- TFP—PEG24—N₃ p84 DBCO—NH—PEG2 tag triester SB-067 rituximab LC—TFP- TFP—PEG24—N₃ p85 DBCO—NH—PEG2 tag triester SB-068 rituximab LC—TFP- TFP—PEG24—N₃ p86 DBCO—NH—PEG2 0.24 tag triester SB-069 rituximab LC—TFP- TFP—PEG24—N₃ p87 DBCO—NH—PEG2 tag triester SB-070 rituximab LC—TFP- TFP—PEG24—N₃ p88 DBCO—NH—PEG2 tag triester SB-071-2 CD22 HC—Q-tag NH₂—PEG23—N₃ P7 5′-DBCO—TEG— >10 >10      C6—SS—C6 SB-072-2 CD22 HC—Q-tag NH₂—PEG23—N₃ p76 DBCO—NH—PEG2 >10 >10      triester SB-073-1 CD22 HC—Q-tag NH₂—PEG23—N₃ p88 DBCO—NH—PEG2 >10 >10      triester SB-073-2 CD22 HC—Q-tag NH₂—PEG23—N₃ p88 DBCO—NH—PEG2 2.2 1.1 0.4  triester SB-074 rituximab LC—TFP- TFP—PEG24—N₃ p95 DBCO—NH—PEG2 tag triester SB-075 rituximab LC—TFP- TFP—PEG24—N₃ p97 DBCO—NH—PEG2 tag triester SB-076 rituximab LC—TFP- TFP—PEG24—N₃ p103 DBCO—NH—PEG2 tag triester SB-077 CD79b HC—Q-tag NH₂—PEG23—N₃ p88 DBCO—NH—PEG2 triester SB-078 CD38 HC—Q-tag NH₂—PEG23—N₃ p95 DBCO—NH—PEG2 1.9  triester SB-079 CD38 HC—Q-tag NH₂—PEG23—N₃ p97 DBCO—NH—PEG2 1.6  triester SB-080 CD38 HC—Q-tag NH₂—PEG23—N₃ p100 DBCO—NH—PEG2 >30      triester SB-081 CD38 HC—Q-tag NH₂—PEG23—N₃ p103 DBCO—NH—PEG2 2.7  triester SB-082 CD38 HC—Q-tag NH₂—PEG3—N₃ p88 DBCO—NH—PEG2 triester SB-083 CD38 HC—Q-tag NH₂—PEG7-N₃ p88 DBCO—NH—PEG2 triester SB-084 CD38 HC—Q-tag NH₂—PEG11-N₃ p88 DBCO—NH—PEG2 triester SB-085 CD38 HC—Q-tag NH₂—PEG35-N₃ p88 DBCO—NH—PEG2 triester SB-086 CD38 HC—Q-tag NH₂—PEG23—N₃ p150 DBCO—NH—PEG2 0.44 triester SB-087 CD38 HC—Q-tag NH₂—PEG23—N₃ p152 DBCO—NH—PEG2 0.5  triester SB-088 CD38 HC—Q-tag NH₂—PEG23—N₃ p153 DBCO—NH—PEG2 0.36 triester SB-089 CD38 HC—Q-tag NH₂—PEG23—N₃ p154 DBCO—NH—PEG2 0.46 triester SB-090 CD38 HC—Q-tag NH₂—PEG23—N₃ p155 DBCO—NH—PEG2 0.23 triester SB-091 CD38 HC—Q-tag NH₂—PEG23—N₃ p156 DBCO—NH—PEG2 0.28 triester SB-092 CD38 HC—Q-tag NH₂—PEG23—N₃ p157 DBCO—NH—PEG2 0.3  triester SB-093 CD38 HC—Q-tag NH₂—PEG23—N₃ p158 DBCO—NH—PEG2 >10      triester SB-094 CD38 HC—Q-tag NH₂—PEG23—N₃ p159 DBCO—NH—PEG2 >10      triester SB-095 CD38 HC—Q-tag NH₂—PEG23—N₃ p160 DBCO—NH—PEG2 >10      triester SB-096 CD38 HC—Q-tag NH₂—PEG23—N₃ p161 DBCO—NH—PEG2 0.33 triester SB-097 CD38 HC—Q-tag NH₂—PEG23—N₃ p162 DBCO—NH—PEG2 0.53 triester SB-098 CD38 HC—Q-tag NH₂—PEG23—N₃ p163 DBCO—NH—PEG2 0.12 triester SB-099 rituximab HC—Q-tag NH₂—PEG23—N₃ p163 DBCO—NH—PEG2 0.14 triester SB-100 CD38 HC—Q-tag NH₂—PEG23—N₃ p164 DBCO—NH—PEG2 1.2  triester SB-101 CD38 HC—Q-tag NH₂—PEG23—N₃ p165 DBCO—NH—PEG2 0.11 triester SB-102 CD38 HC—Q-tag NH₂—PEG23—N₃ p166 DBCO—NH—PEG2 0.25 triester SB-103 CD38 HC—Q-tag NH₂—PEG23—N₃ p167 DBCO—NH—PEG2 0.06 triester SB-104 CD38 HC—Q-tag NH₂—PEG23—N₃ p168 DBCO—NH—PEG2 0.29 triester SB-105 CD38 HC—Q-tag NH₂—PEG23—N₃ p169 DBCO—NH—PEG2 0.05 triester SB-106 CD38 HC—Q-tag NH₂—PEG23—N₃ p170 DBCO—NH—PEG2 0.34 triester SB-107 rituximab LC—PFP TFP—PEG24—N₃ p163 DBCO—NH—PEG2 0.55 triester SB-108 CD38 HC—Q-tag NH₂—PEG23—N₃ p179 DBCO—NH—PEG2 0.12 triester SB-109 CD38 HC—Q-tag NH₂—PEG23—N₃ p179 DBCO—NH—PEG2 0.11 triester SB-110 CD38 HC—Q-tag NH₂—PEG23—N₃ p180 DBCO—NH—PEG2 0.1  triester SB-111 CD38 HC—Q-tag NH₂—PEG23—N₃ p180 DBCO—NH—PEG2 0.11 triester SB-112 CD38 HC—Q-tag NH₂—PEG23—N₃ p181 DBCO—NH—PEG2 0.07 triester SB-113 CD38 HC—Q-tag NH₂—PEG23—N₃ p182 DBCO—NH—PEG2 0.12 triester SB-114 CD38 HC—Q-tag NH₂—PEG23—N₃ p183 DBCO—NH—PEG2 0.1  triester SB-115 CD38 HC—Q-tag NH₂—PEG23—N₃ p183 DBCO—NH—PEG2 0.09 triester SB-116 CD38 HC—Q-tag NH₂—PEG23—N₃ p171 DBCO—NH—PEG2 0.44 triester SB-117 CD38 HC—Q-tag NH₂—PEG23—N₃ p172 DBCO—NH—PEG2 0.52 triester SB-118 CD38 HC—Q-tag NH₂—PEG23—N₃ p173 DBCO—NH—PEG2 0.91 triester SB-119 CD38 HC—Q-tag NH₂—PEG23—N₃ p174 DBCO—NH—PEG2 1.5  triester SB-120 CD38 HC—Q-tag NH₂—PEG23—N₃ p175 DBCO—NH—PEG2 0.07 triester SB-121 CD38 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.11 triester SB-122 CD38 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.08 triester SB-123 CD38 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.05 triester SB-124 CD38 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.05 triester SB-125 CD38 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.05 triester SB-126 CD38 HC—Q-tag NH₂—PEG23—N₃ p177 DBCO—NH—PEG2 0.12 triester SB-127 CD38 HC—Q-tag NH₂—PEG23—N₃ p178 DBCO—NH—PEG2 0.34 triester SB-128 rituximab HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.16 triester SB-129 rituximab HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 0.16 triester SB-130 rituximab HC—Q-tag NH₂—PEG23—N₃ p184 DBCO—NH—PEG2 >10      triester SB-131 rituximab HC—Q-tag NH₂—PEG23—N₃ p185 DBCO—NH—PEG2 >10      triester SB-132 rituximab HC—Q-tag NH₂—PEG23—N₃ p186 DBCO—NH—PEG2 >10      triester SB-133 CD38 HC—Q-tag NH₂—PEG23—N₃ p187 DBCO—NH—PEG2 0.08 triester SB-134 CD38 HC—Q-tag NH₂—PEG23—N₃ p188 DBCO—NH—PEG2 0.08 triester SB-135 CD38 HC—Q-tag NH₂—PEG23—N₃ p189 DBCO—NH—PEG2 0.09 triester SB-136 CD38 HC—Q-tag NH₂—PEG23—N₃ p190 DBCO—NH—PEG2 0.16 triester SB-137 CD38 HC—Q-tag NH₂—PEG23—N₃ p191 DBCO—NH—PEG2 0.21 triester SB-138 CD38 HC—Q-tag NH₂—PEG23—N₃ p199 DBCO—NH—PEG2 0.14 triester SB-139 CD38 HC—Q-tag NH₂—PEG23—N₃ p200 DBCO—NH—PEG2 0.08 triester SB-140 CD38 HC—Q-tag NH₂—PEG23—N₃ p201 DBCO—NH—PEG2 0.12 triester SB-141 CD38 HC—Q-tag NH₂—PEG23—N₃ p202 DBCO—NH—PEG2 0.13 triester SB-142 CD38 HC—Q-tag NH₂—PEG23—N₃ p203 DBCO—NH—PEG2 0.08 triester SB-143 CD38 HC—Q-tag NH₂—PEG23—N₃ p204 DBCO—NH—PEG2 0.14 triester SB-144 CD38 HC—Q-tag NH₂—PEG23—N₃ p205 DBCO—NH—PEG2 0.13 triester SB-145 CD38 HC—Q-tag NH₂—PEG23—N₃ p206 DBCO—NH—PEG2 0.19 triester SB-146 CD38 HC—Q-tag NH₂—PEG23—N₃ p207 DBCO—NH—PEG2 0.02 triester SB-147 CD38 HC—Q-tag NH₂—PEG23—N₃ p208 DBCO—NH—PEG2 0.03 triester SB-148 rituximab HC—Q-tag NH₂—PEG23—N₃ p088 DBCO—NH—PEG2 0.42 triester SB-149 rituximab HC—Q-tag NH₂—PEG23—N₃ p151 DBCO—NH—PEG2 21    triester SB-150 CD38 HC—Q-tag NH₂—PEG23—N₃ p200 DBCO—NH—PEG2 0.12 triester SB-151 CD38 HC—Q-tag NH₂—PEG23—N₃ p201 DBCO—NH—PEG2  0.072 triester SB-152 CD38 HC—Q-tag NH₂—PEG23—N₃ p209 DBCO—NH—PEG2 0.41 triester SB-153 CD38 HC—Q-tag NH₂—PEG23—N₃ p210 DBCO—NH—PEG2 0.71 triester SB-154 CD38 HC—Q-tag NH₂—PEG23—N₃ p211 DBCO—NH—PEG2 1   triester SB-155 CD38 HC—Q-tag NH₂—PEG23—N₃ p212 DBCO—NH—PEG2 0.75 triester SB-156 CD38 HC—Q-tag NH₂—PEG23—N₃ p213 DBCO—NH—PEG2 0.25 triester SB-157 CD38 HC—Q-tag NH₂—PEG23—N₃ p214 DBCO—NH—PEG2 0.22 triester SB-158 CD38 HC—Q-tag NH₂—PEG23—N₃ p215 DBCO—NH—PEG2 0.11 triester SB-159 CD38 HC—Q-tag NH₂—PEG23—N₃ p216 DBCO—NH—PEG2 0.24 triester SB-160 CD38 HC—Q-tag NH₂—PEG23—N₃ p217 DBCO—NH—PEG2 0.37 triester SB-161 CD38 HC—Q-tag NH₂—PEG23—N₃ p218 DBCO—NH—PEG2 0.7  triester SB-162 CD38 HC—Q-tag NH₂—PEG23—N₃ p219 DBCO—NH—PEG2 n/a triester SB-163 CD38 HC—Q-tag NH₂—PEG23—N₃ p222 DBCO—NH—PEG2 >3     triester SB-164 CD38 HC—Q-tag NH₂—PEG23—N₃ p223 DBCO—NH—PEG2 >3     triester SB-165 CD38 HC—Q-tag NH₂—PEG23—N₃ p224 DBCO—NH—PEG2 >1000       triester SB-166 CD38 HC—Q-tag NH₂—PEG23—N₃ p225 DBCO—NH—PEG2 0.33 triester SB-167 CD38 HC—Q-tag NH₂—PEG23—N₃ p226 DBCO—NH—PEG2 0.23 triester SB-168 CD38 HC—Q-tag NH₂—PEG23—N₃ p227 DBCO—NH—PEG2 0.62 triester SB-169 CD38 HC—Q-tag NH₂—PEG23—N₃ p228 DBCO—NH—PEG2 0.12 triester SB-170 CD38 HC—Q-tag NH₂—PEG23—N₃ p229 DBCO—NH—PEG2 0.3  triester SB-171 CD38 HC—Q-tag NH₂—PEG23—N₃ p230 DBCO—NH—PEG2 0.3  triester SB-172 CD38 HC—Q-tag NH₂—PEG23—N₃ p231 DBCO—NH—PEG2 0.19 triester SB-173 CD38 HC—Q-tag NH₂—PEG23—N₃ p199 DBCO—NH—PEG2  0.096 triester SB-174 CD38 HC—Q-tag NH₂—PEG23—N₃ p231 DBCO—NH—PEG2  0.095 triester SB-175 CD38 HC—Q-tag NH₂—PEG23—N₃ p232 DBCO—NH—PEG2 42    triester SB-176 CD38 HC—Q-tag NH₂—PEG23—N₃ p233 DBCO—NH—PEG2 9.1  triester SB-177 CD38 HC—Q-tag NH₂—PEG23—N₃ p233 DBCO—NH—PEG2 33    triester SB-178 CD38 HC—Q-tag NH₂—PEG23—N₃ p235 DBCO—NH—PEG2 9.4  triester SB-179 CD38 HC—Q-tag NH₂—PEG23—N₃ p236 DBCO—NH—PEG2 1.5  triester SB-180 CD38 HC—Q-tag NH₂—PEG23—N₃ p237 DBCO—NH—PEG2 15    triester SB-181 CD38 HC—Q-tag NH₂—PEG23—N₃ p238 DBCO—NH—PEG2 1   triester SB-182 CD38 HC—Q-tag NH₂—PEG23—N₃ p239 DBCO—NH—PEG2 0.03 triester SB-183 CD38 HC—Q-tag NH₂—PEG23—N₃ p240 DBCO—NH—PEG2 0.04 triester SB-184 CD38 HC—Q-tag NH₂—PEG23—N₃ p241 DBCO—NH—PEG2 0.04 triester SB-185 CD38 HC—Q-tag NH₂—PEG23—N₃ p242 DBCO—NH—PEG2 0.23 triester SB-186 CD38 HC—Q-tag NH₂—PEG23—N₃ p243 DBCO—NH—PEG2 0.29 triester SB-187 CD38 HC—Q-tag NH₂—PEG23—N₃ p244 DBCO—NH—PEG2 0.02 triester SB-188 CD38 HC—Q-tag NH₂—PEG23—N₃ p245 DBCO—NH—PEG2 0.11 triester SB-189 CD38 HC—Q-tag NH₂—PEG23—N₃ p246 DBCO—NH—PEG2 0.86 triester SB-190 CD38 HC—Q-tag NH₂—PEG23—N₃ p247 DBCO—NH—PEG2 0.76 triester SB-191 CD38 HC—Q-tag NH₂—PEG23—N₃ p248 DBCO—NH—PEG2 2.4  triester SB-192 CD38 HC—Q-tag NH₂—PEG23—N₃ p249 DBCO—NH—PEG2 2.7  triester SB-193 CD38 HC—Q-tag NH₂—PEG23—N₃ p250 DBCO—NH—PEG2 0.09 triester SB-194 CD38 HC—Q-tag NH₂—PEG23—N₃ p251 DBCO—NH—PEG2  0.067 triester SB-195 CD38 HC—Q-tag NH₂—PEG23—N₃ p252 DBCO—NH—PEG2  0.064 triester SB-196 CD38 HC—Q-tag NH₂—PEG23—N₃ p253 DBCO—NH—PEG2  0.045 triester SB-197 CD38 HC—Q-tag NH₂—PEG23—N₃ p254 DBCO—NH—PEG2  0.042 triester SB-198 CD38 HC—Q-tag NH₂—PEG23—N₃ p255 DBCO—NH—PEG2  0.033 triester SB-199 CD38 HC—Q-tag NH₂—PEG23—N₃ p256 DBCO—NH—PEG2  0.039 triester SB-200 CD38 HC—Q-tag NH₂—PEG23—N₃ p257 DBCO—NH—PEG2  0.039 triester SB-201 CD38 HC—Q-tag NH₂—PEG23—N₃ p258 DBCO—NH—PEG2  0.044 triester SB-202 CD38 HC—Q-tag NH₂—PEG23—N₃ p259 DBCO—NH—PEG2 inact. triester SB-203 CD38 HC—Q-tag NH₂—PEG23—N₃ p260 DBCO—NH—PEG2  0.044 triester SB-204 CD38 HC—Q-tag NH₂—PEG23—N₃ p261 DBCO—NH—PEG2 inact. triester SB-205 CD38 HC—Q-tag PP6 p239 DBCO—NH—PEG2 0.73 triester SB-206 CD38 HC—Q-tag PP6 p242 DBCO—NH—PEG2 0.25 triester SB-207 CD38 HC—Q-tag NH₂—PEG23—N₃ p262 DBCO—NH—PEG2 2.9  triester SB-208 CD38 HC—Q-tag NH₂—PEG23—N₃ p262 DBCO—NH—PEG2 0.09 triester SB-209 CD38 HC—Q-tag NH₂—PEG23—N₃ p263 DBCO—NH—PEG2 0.17 triester SB-210 CD38 HC—Q-tag NH₂—PEG3—N₃ p238 DBCO—NH—PEG2 2.6  triester SB-211 CD38 HC—Q-tag NH₂—PEG3—N₃ p245 DBCO—NH—PEG2 0.1  triester SB-212 CD38 HC—Q-tag NH₂—PEG3—N₃ p246 DBCO—NH—PEG2 2.7  triester SB-213 CD38 HC—Q-tag NH₂—PEG3—N₃ p293 DBCO—NH—PEG2 inact. triester SB-214 CD38 HC—Q-tag NH₂—PEG23—N₃ p267 DBCO—NH—PEG2 93    triester SB-215 CD38 HC—Q-tag NH₂—PEG23—N₃ p268 DBCO—NH—PEG2 >2000       triester SB-216 CD38 HC—Q-tag NH₂—PEG23—N₃ p269 DBCO—NH—PEG2 1.2  triester SB-217 CD38 HC—Q-tag NH₂—PEG23—N₃ p270 DBCO—NH—PEG2 6.2* triester SB-218 CD38 HC—Q-tag PP6 p246 DBCO—NH—PEG2 3.2  triester SB-219 CD38 HC—Q-tag NH₂—PEG3—N₃ p275 DBCO—NH—PEG2 3.7  triester SB-220 CD38 HC—Q-tag NH₂—PEG3—N₃ p276 DBCO—NH—PEG2 3.4  triester SB-221 CD38 HC—Q-tag NH₂—PEG3—N₃ p243 DBCO—NH—PEG2 4   triester SB-222 CD38 HC—Q-tag NH₂—PEG3—N₃ p245 DBCO—NH—PEG2 ~3.9    triester SB-223 CD38 HC—Q-tag PP6 p245 DBCO—NH—PEG2 ~7.5    triester SB-224 mouseCD22 HC—Q-tag PP6 p275 DBCO—NH—PEG2 19   triester SB-225 mouseCD22 HC—Q-tag PP6 p276 DBCO—NH—PEG2 13   triester SB-226 mouseCD22 HC—Q-tag PP6 p292 DBCO—NH—PEG2 45*   triester SB-227 mouseCD22 HC—Q-tag PP6 p293 DBCO—NH—PEG2 39*   triester SB-228 mouseCD20 HC—Q-tag PP6 p275 DBCO—NH—PEG2 21   triester SB-229 mouseCD20 HC—Q-tag PP6 p276 DBCO—NH—PEG2 13   triester SB-230 mouseCD22 HC—Q-tag PP6 p304 DBCO—NH—PEG2 53*   triester SB-231 mouseCD22 HC—Q-tag PP6 p305 DBCO—NH—PEG2 37*   triester SB-232 mouseCD20 HC—Q-tag PP6 p304 DBCO—NH—PEG2 53*   triester SB-233 mouseCD20 HC—Q-tag PP6 p305 DBCO—NH—PEG2 42*   triester SB-234 CD38 HC—Q-tag NH₂—PEG3—N₃ p298 DBCO—NH—PEG2 5.7* triester SB-235 CD38 HC—Q-tag NH₂—PEG3—N₃ p299 DBCO—NH—PEG2 6.5* triester SB-236 CD38 HC—Q-tag NH₂—PEG3—N₃ p300 DBCO—NH—PEG2 4.4* triester SB-237 CD38 HC—Q-tag NH₂—PEG3—N₃ p301 DBCO—NH—PEG2 18*   triester SB-238 CD38 HC—Q-tag NH₂—PEG3—N₃ p302 DBCO—NH—PEG2 9.1* triester SB-239 CD38 HC—Q-tag NH₂—PEG3—N₃ p285 DBCO—NH—PEG2 2.3  triester SB-240 CD38 HC—Q-tag NH₂—PEG3—N₃ p306 DBCO—NH—PEG2 3.9* triester SB-241 CD38 HC—Q-tag NH₂—PEG3—N₃ p307 DBCO—NH—PEG2 n/a triester SB-242 CD38 HC—Q-tag NH₂—PEG3—N₃ p308 DBCO—NH—PEG2 4.5* triester SB-243 CD38 HC—Q-tag NH₂—PEG3—N₃ p309 DBCO—NH—PEG2 n/a triester SB-244 CD38 HC—Q-tag NH₂—PEG3—N₃ p310 DBCO—NH—PEG2 4.9  triester SB-245 CD38 HC—Q-tag NH₂—PEG23—N₃ p301 DBCO—NH—PEG2 13*   triester SB-246 CD38 HC—Q-tag NH₂—PEG23—N₃ p301 DBCO—NH—PEG2 7.6  triester SB-247 CD38 HC—Q-tag NH₂—PEG23—N₃ p302 DBCO—NH—PEG2 3.5  triester SB-248 CD38 HC—Q-tag NH₂—PEG23—N₃ p303 DBCO—NH—PEG2 n/a triester SB-249 CD38 HC—Q-tag NH₂—PEG3—N₃ p243 DBCO—NH—PEG2 6.2  triester SB-250 CD38 HC—Q-tag NH₂—PEG23—N₃ p298 DBCO—NH—PEG2 7.1* triester SB-251 CD38 HC—Q-tag NH₂—PEG23—N₃ p299 DBCO—NH—PEG2 7.7* triester SB-252 CD38 HC—Q-tag NH₂—PEG23—N₃ p300 DBCO—NH—PEG2 5.1* triester SB-253 CD38 HC—Q-tag NH₂—PEG23—N₃ p308 DBCO—NH—PEG2 2.2  triester SB-254 CD38 HC—Q-tag NH₂—PEG23—N₃ p310 DBCO—NH—PEG2 2.5  triester SB-255 CD38 LC—Q-tag NH₂—PEG23—N₃ p298 DBCO—NH—PEG2 5.9* triester SB-256 CD38 LC—Q-tag NH₂—PEG23—N₃ p300 DBCO—NH—PEG2 4.2* triester SB-257 CD38 LC—Q-tag NH₂—PEG23—N₃ p246 DBCO—NH—PEG2 0.57 triester SB-258 CD20 HC—Q-tag NH₂—PEG23—N₃ p276 DBCO—NH—PEG2 8.6 triester SB-259 mouseCD20 HC—Q-tag NH₂—PEG23—N₃ p276 DBCO—NH—PEG2 7.4 triester SB-260 CD38 HC—Q-tag NH₂—PEG23—N₃ p311 DBCO—NH—PEG2 3.6* triester SB-261 CD38 HC—Q-tag NH₂—PEG23—N₃ p312 DBCO—NH—PEG2 4.6* triester SB-262 CD38 HC—Q-tag NH₂—PEG23—N₃ p306 DBCO—NH—PEG2 3.1* triester SB-263 mouseCD20 HC—Q-tag NH₂—PEG23—N₃ p313 DBCO—NH—PEG2 4.9 triester SB-264 mouseCD20 HC—Q-tag NH₂—PEG23—N₃ p314 DBCO—NH—PEG2 4.9 triester SB-265 mouseCD20 HC—Q-tag NH₂—PEG23—N₃ p316 DBCO—NH—PEG2 14   triester SB-266 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p314 DBCO—NH—PEG2 1.7 triester SB-267 CD20 HC—Q-tag NH₂—PEG23—N₃ p313 DBCO—NH—PEG2 8.9 triester SB-268 CD20 HC—Q-tag NH₂—PEG23—N₃ p314 DBCO—NH—PEG2 8.1 triester SB-269 CD20 HC—Q-tag NH₂—PEG23—N₃ p316 DBCO—NH—PEG2 12*   triester SB-270 CD38 HC—Q-tag NH₂—PEG23—N₃ p330 DBCO—NH—PEG2 2.0* triester SB-271 CD38 HC—Q-tag NH₂—PEG23—N₃ p331 DBCO—NH—PEG2 n/a triester SB-272 CD38 HC—Q-tag NH₂—PEG7-N₃ p246 DBCO—NH—PEG2 3.1  triester SB-273 CD38 HC—Q-tag NH₂—PEG11-N₃ p246 DBCO—NH—PEG2 2.7  triester SB-274 CD38 LC—Q-tag NH₂—PEG3—N₃ p246 DBCO—NH—PEG2 3.1  triester SB-275 CD38 LC—Q-tag NH₂—PEG7-N₃ p246 DBCO—NH—PEG2 1.9  triester SB-276 CD38 LC—Q-tag NH₂—PEG11-N₃ p246 DBCO—NH—PEG2 1.2  triester SB-277 mouseCD22 HC—Q-tag PP6 p313 DBCO—NH—PEG2 1.4 triester SB-278 CD38 HC—Q-tag PP10 p246 DBCO—NH—PEG2 2.8  triester SB-279 CD38 HC—Q-tag PP14 p246 DBCO—NH—PEG2 1.1  triester SB-280 CD38 HC—Q-tag PP18 p246 DBCO—NH—PEG2 1.3  triester SB-281 CD38 HC—Q-tag PP24 p246 DBCO—NH—PEG2 3.7  triester SB-282 CD38 HC—Q-tag NH₂—PEG23—N₃ p334 DBCO—C6-dT 1.2* SB-283 CD38 HC—Q-tag NH₂—PEG23—N₃ p335 DBCO—C6-dT 1.9* SB-284 CD38 HC—Q-tag NH₂—PEG23—N₃ p347 DBCO—NH—PEG2 >30      triester SB-285 CD38 HC—Q-tag NH₂—PEG23—N₃ p348 DBCO—NH—PEG2 >30      triester SB-286 CD38 HC—Q-tag NH₂—PEG23—N₃ p349 DBCO—NH—PEG2 >30      triester SB-287 CD38 HC—Q-tag NH₂—PEG23—N₃ p350 DBCO—NH—PEG2 3.7* triester SB-288 CD38 HC—Q-tag NH₂—PEG23—N₃ p351 DBCO—NH—PEG2 0.8  triester SB-289 CD38 HC—Q-tag NH₂—PEG23—N₃ p355 DBCO—NH—PEG2 0.67 triester SB-290 CD38 HC—Q-tag NH₂—PEG23—N₃ p355 DBCO—NH—PEG2 1.44 triester SB-291 CD38 HC—Q-tag NH₂—PEG23—N₃ p356 DBCO—NH—PEG2 0.47 triester SB-292 CD38 HC—Q-tag NH₂—PEG23—N₃ p357 DBCO—NH—PEG2 1.94 triester SB-293 CD38 HC—Q-tag NH₂—PEG23—N₃ p358 DBCO—NH—PEG2 1.02 triester SB-294 CD38 HC—Q-tag NH₂—PEG23—N₃ p359 DBCO—NH—PEG2 2.43 triester SB-295 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p373 X5—DBCO 44   SB-296 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p374 X5—DBCO 47   SB-297 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p375 X5—DBCO 103    SB-298 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p376 X5—DBCO 243    SB-299 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p377 X5—DBCO 64   SB-300 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p378 X5—DBCO 29   SB-301 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p379 X5—DBCO 10   SB-302 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p380 X5—DBCO 7   SB-303 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p381 X5—DBCO 13   SB-304 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p382 X5—DBCO 13   SB-305 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p383 X5—DBCO 25   SB-306 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p384 X5—DBCO 19   SB-307 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p385 X5—DBCO inact SB-308 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p386 X5—DBCO 28   SB-309 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p387 X5—DBCO 20   SB-310 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p388 X5—DBCO 8   SB-311 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p389 X5—DBCO 5*  SB-312 CD38 HC—Q-tag NH₂—PEG23—N₃ p361 DBCO—NH—PEG2 0.67 1   triester SB-313 CD38 HC—Q-tag NH₂—PEG23—N₃ p362 DBCO—NH—PEG2 0.85 triester SB-314 CD38 HC—Q-tag NH₂—PEG23—N₃ p363 DBCO—NH—PEG2 1.09 triester SB-315 CD38 HC—Q-tag NH₂—PEG23—N₃ p364 DBCO—NH—PEG2 1.77 triester SB-316 CD38 HC—Q-tag NH₂—PEG23—N₃ p365 DBCO—NH—PEG2 1.33 triester SB-317 CD38 HC—Q-tag NH₂—PEG23—N₃ p366 DBCO—NH—PEG2 2.84 triester SB-318 CD38 HC—Q-tag NH₂—PEG23—N₃ p367 DBCO—NH—PEG2 2.17 triester SB-319 CD38 HC—Q-tag NH₂—PEG23—N₃ p368 DBCO—NH—PEG2 1.33 triester SB-320 CD38 HC—Q-tag NH₂—PEG23—N₃ p369 DBCO—NH—PEG2 0.76 triester SB-321 CD38 HC—Q-tag NH₂—PEG23—N₃ p370 DBCO—NH—PEG2 0.84 triester SB-322 CD38 HC—Q-tag NH₂—PEG23—N₃ p371 DBCO—NH—PEG2 0.5  6.7 triester SB-323 CD38 HC—Q-tag NH₂—PEG23—N₃ p372 DBCO—NH—PEG2 0.66 triester SB-324 CD38 HC—Q-tag NH₂—PEG23—N₃ p390 DBCO—NH—PEG2 3.9* triester SB-325 CD38 HC—Q-tag NH₂—PEG23—N₃ p391 DBCO—NH—PEG2 inact. triester SB-326 CD38 HC—Q-tag NH₂—PEG23—N₃ p392 DBCO—NH—PEG2 inact. triester SB-327 CD38 HC—Q-tag NH₂—PEG23—N₃ p396 DBCO—NH—PEG2 7.1* triester SB-328 CD38 HC—Q-tag NH₂—PEG23—N₃ p397 DBCO—NH—PEG2 inact. triester SB-329 CD38 HC—Q-tag NH₂—PEG23—N₃ p398 DBCO—NH—PEG2 inact. triester SB-330 CD38 HC—Q-tag NH₂—PEG23—N₃ p399 DBCO—NH—PEG2 inact. triester SB-331 CD38 HC—Q-tag NH₂—PEG23—N₃ p400 DBCO—NH—PEG2 inact. triester SB-332 CD38 HC—Q-tag NH₂—PEG23—N₃ p404 DBCO—NH—PEG2 10.4 triester SB-333 CD38 HC—Q-tag NH₂—PEG23—N₃ p405 DBCO—NH—PEG2 25.8 triester SB-334 CD38 HC—Q-tag NH₂—PEG23—N₃ p407 DBCO—NH—PEG2 7.1 triester SB-335 CD38 HC—Q-tag NH₂—PEG23—N₃ p409 DBCO—NH—PEG2 51.6 triester SB-336 CD38 HC—Q-tag NH₂—PEG23—N₃ p410 DBCO—NH—PEG2 10.3 triester SB-337 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p313 DBCO—NH—PEG2 48   triester SB-338 mouseCD22 HC—Q-tag PP12 p313 DBCO—NH—PEG2 triester SB-339 mouseCD22 HC—Q-tag NH₂—PEG23—N₃ p346 DBCO—NH—PEG2 triester SB-340 BDCA2 HC—Q-tag NH₂—PEG23—N₃ p228 DBCO—NH—PEG2 triester SB-341 BDCA2 HC—Q-tag NH₂—PEG23—N₃ p222 DBCO—NH—PEG2 triester SB-342 BDCA2 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 triester SB-343 BDCA4 HC—Q-tag NH₂—PEG23—N₃ p176 DBCO—NH—PEG2 triester SB-344 CD22 HC—Q-tag PP16 p313 DBCO—NH—PEG2 triester SB-345 CD38 HC—Q-tag NH₂—PEG23—N₃ p151 DBCO—NH—PEG2 triester SB-346 CD38 HC—Q-tag NH₂—PEG23—N₃ p192 DBCO—NH—PEG2 triester SB-347 CD38 HC—Q-tag NH₂—PEG23—N₃ p425 DBCO—NH—PEG2 2.5 triester SB-348 CD38 HC—Q-tag NH₂—PEG23—N₃ p426 DBCO—NH—PEG2 24   triester SB-349 CD38 HC—Q-tag NH₂—PEG23—N₃ p427 DBCO—NH—PEG2  0.016 triester SB-350 CD38 HC—Q-tag NH₂—PEG23—N₃ p428 DBCO—NH—PEG2 triester SB-351 CD38 HC—Q-tag PP6 p243 DBCO—NH—PEG2 triester SB-352 CD38 HC—Q-tag PP6 p245 DBCO—NH—PEG2 triester SB-353 CD38 HC—Q-tag PP10 p308 DBCO—NH—PEG2 triester SB-354 CD38 HC—Q-tag PP14 p308 DBCO—NH—PEG2 triester SB-355 CD38 HC—Q-tag PP18 p308 DBCO—NH—PEG2 triester SB-356 CD38 HC—Q-tag PP24 p308 DBCO—NH—PEG2 triester SB-357 mouseCD22 HC—Q-tag PP6 p294 DBCO—NH—PEG2 triester SB-358 mouseCD22 HC—Q-tag PP6 p295 DBCO—NH—PEG2 triester SB-359 mouseCD22 HC—Q-tag PP6 p296 DBCO—NH—PEG2 triester SB-360 mouseCD22 HC—Q-tag PP6 p297 DBCO—NH—PEG2 triester SB-361 mouseCD22 HC—Q-tag PP26 p313 DBCO—NH—PEG2 triester SB-362 mouseCD22 HC—Q-tag PP38 p313 DBCO—NH—PEG2 triester SB-363 mouseCD22 HC—Q-tag PP27 + TCO p313 DBCO—NH—PEG2 triester SB-364 mouseCD22 HC—Q-tag PP29 + TCO p313 DBCO—NH—PEG2 triester SB-365 mouseCD22 HC—Q-tag PP39 + TCO p313 DBCO—NH—PEG2 triester SB-366 mouseCD22 HC—Q-tag PP39 + TCO p313 DBCO—NH—PEG2 triester In Table 6-A, column A provides IL-6 expression in DB cells (EC50, nM); column B provides IL-10 expression in DB cells (EC50, nM); column C provides NFκB activation Ramos blue cells (EC50, nM); column D provides NFκB activation in Ramos blue cells after 24 h preincubation in mouse serum (EC50, nM); column E provides IL-6 induction by qPCR in mouse A20 lymphoma cells (EC50, nM); and column F provides IL-6 induction in mouse A20-hCD20 Lymphoma cells (EC50, nM). All DBCO/azido conjugations were performed under metal-free 1,3-dipolar cycloaddition reaction conditions; DAR1 indicates a polynucleotide/antibody ratio of 1; DAR2 indicates a polynucleotide/antibody ratio of 2; and n/a stands for no activation. In table 6-A, * indicates sub-optimal activation. In table 6-A, CD38 stands for an anti-CD38 antibody; CD22 stands for an anti-CD22 antibody; CD79b stands for an anti-CD79b antibody; mouseCD22 stands for anti-mouseCD22 antibody; BDCA2 stands for anti-BDCA2 antibody; and BDCA4 stands for anti-BDCA4 antibody. In Table 6-A, TCO is trans-cyclooctenyl-based group bonded to a targeting moiety. TCO has a structure illustrated in FIG. 1B.

TABLE 6-B Conjugate Ab- Compound Antibody Conjugation Complementary CpG # (Ab) Site Reactive Group Sequence Conjugating Group Conjugation A B C D E SB-367 CD38 HC—Q-tag NH2—PEG23—N3 p429 DBCO—NH—PEG2 Cu free triester Click SB-368 CD38 HC—Q-tag NH2—PEG23—N3 p431 DBCO—NH—PEG2 Cu free triester Click SB-369 CD38 HC—Q-tag NH2—PEG23—N3 p433 DBCO—NH—PEG2 Cu free 1 triester Click SB-370 CD38 HC—Q-tag NH2—PEG23—N3 p434 DBCO—NH—PEG2 Cu free 1.5 triester Click SB-371 CD38 HC—Q-tag NH2—PEG23—N3 p435 DBCO—NH—PEG2 Cu free 0.9 triester Click SB-372 CD38 HC—Q-tag NH2—PEG23—N3 p436 DBCO—NH—PEG2 Cu free 2.2 triester Click SB-373 CD38 HC—Q-tag NH2—PEG23—N3 p438 DBCO—NH—PEG2 Cu free 2.3 triester Click SB-374 CD38 HC—Q-tag NH2—PEG23—N3 p439 DBCO—NH—PEG2 Cu free triester Click SB-375 CD38 HC—Q-tag NH2—PEG23—N3 p440 DBCO—NH—PEG2 Cu free triester Click SB-376 CD38 HC—Q-tag NH2—PEG23—N3 p441 DBCO—NH—PEG2 Cu free triester Click SB-377 CD38 HC—Q-tag NH2—PEG23—N3 p442 DBCO—NH—PEG2 Cu free triester Click SB-378 mouseCD22 HC—Q-tag NH2—PEG23—N3 p439 DBCO—NH—PEG2 Cu free triester Click SB-379 mouseCD22 HC—Q-tag NH2—PEG23—N3 p440 DBCO—NH—PEG2 Cu free triester Click SB-380 mouseCD22 HC—Q-tag NH2—PEG23—N3 p441 DBCO—NH—PEG2 Cu free triester Click SB-381 mouseCD22 HC—Q-tag NH2—PEG23—N3 p442 DBCO—NH—PEG2 Cu free triester Click SB-382 mouseCD22 HC—Q-tag NH2—PEG23—N3 p425 DBCO—NH—PEG2 Cu free triester Click SB-383 CD38 HC—Q-tag NH2—PEG23—N3 p445 DBCO—NH—PEG2 Cu free 0.6 triester Click SB-384 CD38 HC—Q-tag NH2—PEG23—N3 p446 DBCO—NH—PEG2 Cu free 1 triester Click SB-385 CD38 HC—Q-tag NH2—PEG23—N3 p447 DBCO—NH—PEG2 Cu free 6.9 triester Click SB-386 CD38 HC—Q-tag NH2—PEG23—N3 p448 DBCO—NH—PEG2 Cu free 0.7 triester Click SB-387 CD38 HC—Q-tag NH2—PEG23—N3 p449 DBCO—NH—PEG2 Cu free inact. triester Click SB-388 mouseCD19 HC—Q-tag NH2—PEG12—N3 p313 DBCO—NH—PEG2 Cu free triester Click SB-389 PDL-1 HC—Q-tag NH2—PEG23—N3 p313 DBCO—NH—PEG2 Cu free triester Click SB-390 mouseCD22 HC—Q-tag NH2—PEG23—N3 p450 DBCO—NH—PEG2 Cu free inact. 0.2 triester Click SB-391 mouseCD22 HC—Q-tag NH2—PEG23—N3 p451 DBCO—NH—PEG2 Cu free inact. 0.05 triester Click SB-392 mouseCD22 HC—Q-tag NH2—PEG23—N3 p452 DBCO—NH—PEG2 Cu free inact. inact. triester Click SB-393 mouseCD22 HC—Q-tag NH2—PEG23—N3 p453 DBCO—NH—PEG2 Cu free inact. inact. triester Click SB-394 mouseCD22 HC—Q-tag NH2—PEG23—N3 p454 DBCO—NH—PEG2 Cu free inact. inact. triester Click SB-395 mouseCD22 HC—Q-tag NH2—PEG23—N3 p455 DBCO—NH—PEG2 Cu free triester Click SB-396 mouseCD22 HC—Q-tag NH2—PEG23—N3 p456 DBCO—NH—PEG2 Cu free triester Click SB-397 mouseCD22 HC—Q-tag NH2—PEG23—N3 p457 DBCO—NH—PEG2 Cu free triester Click SB-398 mouseCD22 HC—Q-tag NH2—PEG23—N3 p458 DBCO—NH—PEG2 Cu free triester Click SB-399 mouseCD22 HC—Q-tag NH2—PEG23—N3 p459 DBCO—NH—PEG2 Cu free triester Click SB-400 mouseCD22 HC—Q-tag NH2—PEG23—N3 p460 DBCO—NH—PEG2 Cu free triester Click SB-401 mouseCD22 HC—Q-tag NH2—PEG23—N3 p461 DBCO—NH—PEG2 Cu free triester Click SB-402 mouseCD22 HC—Q-tag NH2—PEG23—N3 p462 DBCO—NH—PEG2 Cu free triester Click SB-403 mouseCD22 HC—Q-tag NH2—PEG123— p463 DBCO—NH—PEG2 Cu free N3 triester Click SB-404 mouseCD22 HC—Q-tag NH2—PEG23—N3 p464 DBCO—NH—PEG2 Cu free triester Click SB-405 mouseCD22 HC—Q-tag NH2—PEG23—N3 p465 DBCO—NH—PEG2 Cu free triester Click SB-406 mouseCD22 HC—Q-tag NH2—PEG23—N3 p466 DBCO—NH—PEG2 Cu free triester Click SB-407 mouseCD22 HC—Q-tag NH2—PEG23—N3 p469 DBCO—NH—PEG2 Cu free triester Click SB-408 mouseCD22 HC—Q-tag NH2—PEG23—N3 p425 DBCO—NH—PEG2 Cu free triester Click SB-409 CD38 HC—Q-tag NH2—PEG23—N3 p470 DBCO—NH—PEG2 Cu free 0.8 triester Click SB-410 CD38 HC—Q-tag NH2—PEG23—N3 p471 DBCO—NH—PEG2 Cu free inact. triester Click SB-411 CD38 HC—Q-tag NH2—PEG23—N3 p472 DBCO—NH—PEG2 Cu free inact. triester Click SB-412 CD38 HC—Q-tag NH2—PEG23—N3 p473 DBCO—NH—PEG2 Cu free inact. triester Click SB-413 CD38 HC—Q-tag NH2—PEG23—N3 p474 DBCO—NH—PEG2 Cu free inact. triester Click SB-414 CD38 HC—Q-tag NH2—PEG23—N3 p475 DBCO—NH—PEG2 Cu free inact. triester Click SB-415 CD38 HC—Q-tag NH2—PEG23—N3 p476 DBCO—NH—PEG2 Cu free inact. triester Click SB-416 humanCD22 HC—Q-tag NH2—PEG23—N3 p313 DBCO—NH—PEG2 Cu free triester Click SB-417 mouseCD22 HC—Q-tag NH2—PEG23—N3 p313 DBCO—NH—PEG2 Cu free 2.2 triester Click SB-418 mouseCD22 HC—Q-tag NH2—PEG11—N3 p313 DBCO—NH—PEG2 Cu free 2 triester Click SB-419 mouseDEC205 HC—Q-tag NH2—PEG12—N3 p313 DBCO—NH—PEG2 Cu free triester Click SB-420 mouseCD22 HC—Q-tag NH2—PEG3—N3 p480 DBCO—NH—PEG2 Cu free inact. triester Click SB-421 mouseCD22 HC—Q-tag NH2—PEG23—N3 p481 DBCO—NH—PEG2 Cu free 0.8 triester Click SB-422 humanCD22 HC—Q-tag NH2—PEG23—N3 p480 DBCO—NH—PEG2 Cu free triester Click SB-423 humanCD22 HC—Q-tag NH2—PEG23—N3 p481 DBCO—NH—PEG2 Cu free triester Click SB-424 mouseCD22 HC—Q-tag NH2—PEG23—N3 p486 DBCO—NH—PEG2 Cu free inact. triester Click SB-425 humanCD22 HC—Q-tag NH2—PEG23—N3 p486 DBCO—NH—PEG2 Cu free 4.7 4.1 triester Click SB-426 humanCD22 HC—Q-tag NH2—PEG23—N3 p308 DBCO—NH—PEG2 Cu free 5.2 4.9 triester Click SB-427 humanCD22 HC—Q-tag NH2—PEG23—N3 p487 DBCO—NH—PEG2 Cu free 6 5.7 triester Click SB-428 humanCD22 HC—Q-tag NH2—PEG23—N3 p488 DBCO—NH—PEG2 Cu free 6.7 7 triester Click SB-429 humanCD22 HC—Q-tag NH2—PEG23—N3 p489 DBCO—NH—PEG2 Cu free triester Click SB-430 humanCD22 HC—Q-tag NH2—PEG23—N3 p425 DBCO—NH—PEG2 Cu free triester Click In Table 6-2, column A provides NFκB activation Ramos blue cells (EC₅₀, nM); column B provides IL-6 secretion in mouse splenocytes, DAR1 (EC₅₀, nm); column C provides IL-6 secreition in mouse splenocytes, DAR2 (EC₅₀, nm); column D provides NFκB activation in Daudi-NFκB-Luc cells, DAR1 (EC₅₀, nm); column E provides NFκB activation in Daudi-NFκB-Luc cells, DAR2 (EC₅₀, nm). In table 6-2, CD38 stands for an anti-CD38 antibody; CD22 stands for an anti-CD22 antibody; mouseCD22 stands for anti-mouseCD22 antibody; DAR1 indicates a polynucleotide/antibody ratio of 1; DAR2 indicates a polynucleotide/antibody ratio of 2.

Example 3. In Vitro and In Vivo Profiling of the Exemplary Conjugates of the Invention

Cells: Human DB, Daudi, Raji, Ramos, SUDHL10, and NCI-H929, and mouse A20 cells were purchased from the American Type Culture Collection (ATCC) and were cultured in RPMI containing 10% FBS. Ramos-blue and HEK-Blue-hTLR9 cells were purchased from Invivogen and were maintained according to supplier's recommendations. TLR9 expression of all the cells was confirmed by qPCR.

Flow cytometry: Cell surface expression of receptors of interest was measured by FACS analysis using CyFlow ML flow cytometer (Partec) and commercially available antibodies (Biolegend, BD Biosciences, San Diego).

In Vitro Profiling of Immunostimulating Polynucleotides or Conjugates Thereof:

In some experiments, the activity of immunostimulating polynucleotides or conjugates thereof was assessed using human or mouse lymphoma cells. In these experiments, test compounds were added to cells (1-4×10⁵/well) in 96-well plates and incubated at 37° C., 5% CO₂ for 24-72 h. At the end of the incubation period, the culture media was removed and used to assess cytokine secretion (DB cells) or alkaline phosphatases secretion as a measure of NFkB activation (Ramos-blue, HEK-Blue-hTLR9 cells). Secreted cytokines were measured by commercially available ELISA kits. The remaining cells were lysed, total RNA purified and cytokine gene expression (IL-6 and IL-10) was quantified by qPCR, and normalized to house-keeping genes (B2M, GAPDH, or PPIB). Gene expression for other cytokines (e.g., IL-8, IL-12a, and IL-12b) can also be determined using methods known in the art, e.g., qPCR.

In some experiments, immunostimulating polynucleotides were profiled in HeLa cells stably expressing human or mouse TLR-9 and an NFkB-luciferase reporter plasmid. Intracellular luciferase activity was quantified by the addition of luciferin (Britelite, Perkin Elmer) and the luminescence signal was captured using Victor2 luminometer (Perkin Elmer).

In some experiments, the activity of immunostimulating polynucleotides was assessed using freshly isolated mouse splenocytes. Spleens from C57B16 mice were harvested, diced through sterile 70 μm filters using ice-cold PBS. Cells were then washed with PBS and the red blood cells were lysed using commercial RBC lysis buffer. Cells were washed again with PBS at 4° C., re-suspended in RPMI containing 10% FBS and seeded in 96-well plates (2×10⁵ cells/well) and incubated at 37° C., 5% CO₂ for 2-4 h. Test compounds were then added and incubated at 37° C., 5% CO₂ for additional 24-72 h. The supernatant was carefully removed and cytokine levels were quantitated by ELISA. The cells were lysed, total RNA was purified, and the gene expression was measured by qPCR using standard methods.

In some experiments, test compounds were evaluated for cytokine secretion upon incubation with mouse bone marrow differentiated dendritic cells (DC). In these experiments mouse primary bone marrow progenitor cells were isolated from the femurs and tibias of C57B16 mice according to published protocols. Cells were immediately washed with PBS at 4° C. and red blood cells lysed using a commercial lysis buffer. Cell were suspended at 1.2×10⁶ cells/ml in RPMI containing 10% fetal calf serum, seeded in 96-well plates, and differentiated to DCs with either recombinant mouse GM-CSF (100 ng/ml) and mouse TNFα (10 ng/ml) or with the addition of FLT3L for 7 days. Test compounds were added and incubated for 24-72 hrs. Cytokine secretion was measured in the culture supernatant by ELISA and cells were lysed and used to assess gene expression by qPCR using standard methods.

In some experiments, test compounds were incubated in 95% plasma from mice, rats, monkeys, or heathy humans to assess stability. In these experiments, blood (EDTA) was collected from at least 3 individuals; plasma was isolated by centrifugation and pooled. Test compounds were spiked in plasma in sealed tubes and incubated at 37° C. for 1-72 hrs, after which the compounds were diluted in RPMI+10% FBS to the appropriate concentrations and assessed for functional activity in the test systems outlined above.

In some experiments, the effect of test compounds on lymphocyte proliferation can be evaluated using methods known in the art, e.g., using Cell Titer Glo kit (Promega) after incubation with 1×10⁵ cells/well for 1, 2, 4 or 7 days.

In some experiments, the effect of test compounds on cellular apoptosis can be assessed using methods known in the art, e.g., by annexin-V cell surface expression by FACS using CyFlow ML flow cytometer (Partec).

Cellular dependent cytotoxic (CDC) activity of the conjugates of the invention was assessed as follows. Daudi cells were cultured in RPMI1640 GlutaMAX supplemented with 10% FBS and Pen/Strep. Daudi cells were plated onto a 96-well format by centrifuging cells, removing media, and resuspending in OPTIMEM supplemented with 10% human serum (SIGMA cat #S1764, LOT #SLBQ0752V, 46CH50) at a concentration of 0.8×10⁶ cells/mL and volume of 50 μL/well. Compound dilution plates were prepared in OPTIMEM at double concentration, and 50 μL per well of compound dilution were added giving a final concentration of human serum at 5%. The plated cultures were incubated at 37° C. under 5% CO₂ for 2 hours. Alamar Blue viability reagent (10 μL/well) was added, and the resulting cultures were incubated at 37° C. under 5% CO₂ for 3-18 h. The results were read out on a plate reader using fluorescence (EX560 and EM590).

Cytokine induction of the conjugates of the invention in human peripheral blood mononuclear cells (hPBMCs) was assessed as follows. Human PBMCs were isolated from LRS obtained from the San Diego Blood Bank. Plasmacytoid dendritic cells were isolated from hPBMCs with a MACs kit (Miltenyi Biotec) and immediately were plated onto a 96-well format (5×10⁴ cells/well density) in Complete RPMI. Compounds were added after 2 hours and incubated at 37° C. under 5% CO₂ for 20 hours. Following the incubation, the media was collected and cytokine levels were determined by ELISA (BioLegend).

The results of the in vitro profiling experiments are summarized in Tables 2 and 6-23 and in FIGS. 5-33.

FIG. 5 shows that CpG polynucleotide unconjugated to an antibody requires phosphorothioate backbone to induce cytokine, as determined by the levels of the expression of IL-6.

FIGS. 6-8 provide a comparison of TLR9 agonist activities of exemplary conjugates of the invention and the unconjugated CpG polynucleotide with phosphorothioate backbone.

FIGS. 9-15 show (1) that phosphorothioates are important for TLR9 agonist activity of immunostimulating polynucleotides in the absence of a conjugated targeting moiety, and (2) that conjugation of a targeting moiety to a phosphate bonded to 5′-terminal nucleoside of a CpG polynucleotide reduces its TLR9 agonist activity.

FIGS. 16 and 17 show that a conjugate of the invention including two polynucleotides can exhibit immunostimulating activity, as measured by the NFκB activation, that is higher relative to the conjugate of the invention including one polynucleotide.

Table 7 shows that the inclusion of 5′-terminal 5-iodouridine enhances activity of the immunostimulating polynucleotides.

TABLE 7 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) Length SEQ ID NO: SB-109 p179

CG U CGTTTTGTCGTTTTGTCGTT-C3 0.12 24 179 SB-110 p180

CGTCGTTTTGTCGTTTTGTCG T T-C3 0.12 24 180 SB-112 p181

CGTCG T TTTGTCGTTTTGTCGTT-C3 0.07 24 181 SB-113 p182

CGTCG T TTTGTCGTTTTGTCGTT-C3 0.12 24 182 SB-096 p161 TCG T CGTTTTGTCGTTTTGTCGTT-C3 0.33 24 161 SB-114 p183

CG T CGTTTTGTCGTTTTGTCGTT-C3 0.10 24 183 SB-098 p163

CGTCGTTTTGTCGTTTTGTCG t t-C3 0.12 24 163 SB-057 p88 TCGTCGTTTTGTCGTTTTGTCGTT 0.36 24 88

Tables 8 and 9 show that 3′-truncation of immunostimulating polynucleotide sequences and shorter spacing between ISS may not be detrimental and may even improve the immunostimulating activity of an immunostimulating polynucleotide. These tables also show that as few as two ISS may be sufficient for immunostimulation.

TABLE 8 Conjugate SEQ ID Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) Length NO: SB-098 p163

CGTCGTTTTGTCGTTTTGTCG t t-C3 0.16 24 163 SB-114 p183

CG T CGTTTTGTCGTTTTGTCGTT-C3 0.07 24 183 SB-120 p175

CG T CGTTTTGTCGTTTT 0.05 18 175 SB-121 p176

TCG T CGTTTTGTCGTT 0.10 16 176 SB-126 p177

CGTCGTTTTGTCG 0.05 14 177 SB-127 p178

CG T CGTTTTGT 0.27 12 178 SB-116 p171 TCG T CGTTTTGTCGTTTT 0.44 18 171 SB-117 p172 TCG T CGTTTTGTCGTT 0.52 16 172 SB-118 p173 TCG T CGTTTTGTCG 0.91 14 173 SB-118 p174 TCG T CGTTTTGT 1.5 12 174 SB-097 p162 TCGTCGTTTTGTCGTT T T 0.53 18 162

TABLE 9 Con- Poly- jugate Con- nucleo- EC50  SEQ ID jugate tide Sequence (5′ to 3′) (nM) Length NO: SB-115 p183

CG T CGTTTTGTCGTTTTGTCGTT-C3 0.07 24 183 SB-121 p176

TCG T CGTTTTGTCGTT 0.10 16 176 SB-133 p187

CGTCGTTTGTCGTT-C3 0.08 15 187 SB-134 p188

CG T CGTTGTCGTT-C3 0.08 14 188 SB-135 p189

CG T CGTGTCGTT-C3 0.08 13 189 SB-136 p190

CG T CGTTCGTT-C3 0.16 12 190 SB-137 p191

CG T CGTCGTT-C3 0.21 11 191

FIG. 18 shows that conjugates containing immunostimulating polynucleotides having all internucleoside phosphoesters that are phosphorothioate-based exhibit activity that is comparable to that of free p1 and that conjugates containing short immunostimulating polynucleotides exhibit activity that is comparable to that of the conjugates containing full-length immunostimulating polynucleotides. The data shown in FIG. 18 are listed in Table 10.

TABLE 10 Conjugate SEQ ID Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) Length NO: SB-345 p151 tcgtcgttttgtcgttttgtcg t T ~200 24 151 SB-088 p153 tcgtcGTTTTGTCGTTTTGTCG t t 3.2 24 153 SB-057 p88 TCGTCGTTTTGTCGTTTTGTCG T T 0.25 24 88 SB-115 p183

CG T CGTTTTGTCGTTTTGTCGTT-C3 0.09 24 183 SB-123 p176

TCG T CGTTTTGTCGTT ~0.06 16 176 SB-135 p189

CG T CGTGTCGTT-C3 0.08 13 189 SB-346 p192

GC T GCTTTTGTGCTTTTGTGCTT inactive 24 192 — p1 tcgtcgttttgtcgttttgtcgtt 200 24 1

FIG. 19 shows that conjugates containing shorter immunostimulating polynucleotides having all internucleoside phosphoesters that are phosphorothioate-based exhibit activity that is superior that of the conjugated containing longer immunostimulating polynucleotides having all internucleoside phosphoesters that are phosphorothioate-based. The data shown in FIG. 19 are summarized in Table 11.

TABLE 11 Conjugate SEQ ID Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) Length NO: SB-175 p232 tcgtcgttttgtcgttttgtcg t T-C3 42 24 232 SB-176 p233

cgtcgttttgtcgttttgtcg t T-C3 9.1 24 233 SB-178 p235 tcgtcgttttgtcg t T-C3 9.5 16 235 SB-179 p236

cgtcgttttgtcg t T-C3 <3 16 236 SB-180 p237 tcgtcgtgtcg t T-C3 15 13 237 SB-181 p238

cgtcgtgtcg t T-C3 <3 13 238 — p1 tcgtcgttttgtcgttttgtcgtt 170 24 1

FIGS. 20 and 21 show that immunostimulating polynucleotides having phosphate-based internucleoside phosphoester(s) within the 5′-terminal ISS exhibit higher immunostimulating activity than immunostimulating polynucleotides having phosphorothioate-based internucleoside phosphoester(s) within 5′-terminal ISS. The data shown in FIGS. 20 and 21 are summarized in Table 12.

TABLE 12 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: SB-181 p238

cgtcgtgtcg t T-C3 1.00 238 SB-183 p240

CgtCgtgtCg t t-C3 0.04 240 SB-184 p241

Cgtcgtgtcg t t-C3 0.04 241 SB-185 p242

cgtcgtgtcg t t-C3 0.09 242 SB-186 p243

cgtcgtgtcg t t-C3 0.49 243 SB-179 p236

cgtcgttttgtcg t T-C3 1.55 236 SB-182 p239

CgtCgtgtCg T T-C3 0.03 239 SB-187 p244

Cg t cgtgtcgtt-C3 0.02 244 SB-188 p245

cg t cgtgtcgtt-C3 0.04 245 SB-189 p246

cg t cgtgtcgtt-C3 1.14 246

FIG. 22 shows that 5′-terminal human ISS sequence is preferably UCG. The data shown in FIG. 22 are summarized in Table 13.

TABLE 13 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: SB-186 p243

cgtcgtgtcg t t-C3 0.3 243 SB-185 p242

cgtcgtgtcg t t-C3 0.2 242 SB-207 p262

cg

cgtgtcg t t-C3 2.9 262 SB-209 p263

cgtcgtg

cgtt-C3 0.2 263 SB-215 p268 cg t cgtg

cgtt-C3 inactive 268

FIG. 23 shows that inclusion of 5-iodouridine in 5′-terminal ISS has a stronger enhancing effect on immunostimulating activity of an immunostimulating polynucleotide. The data shown in FIG. 23 are summarized in Table 14.

TABLE 14 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: SB-186 p243

cgtcgtgtcg t t-C3 0.3 243 SB-245 p301 tcg

cgtgtcg t t-C3 >30 301 SB-261 p312 tcg

cgtgtcg t t-C3 >30 312

FIGS. 24 and 25 show that the immunostimulating activity of polynucleotides containing phosphate-based internucleoside phosphotriesters may be higher than that of the corresponding polynucleotides containing phosphorothioate-based internucleoside phosphotriesters. The data shown in FIGS. 24 and 25 are summarized in Table 15.

TABLE 15 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: SB-189 p246

cg t cgtgtcgtt-C3 0.34 246 SB-288 p351

cg t cgtgtcgtt-C3 0.89 351 SB-289 p355

cg T cgtgtcgTt-C3 0.67 355 SB-290 p355

cg T cgtgtcgtt-C3 1.44 355 SB-291 p356

cg T cgtgtcgTt-C3 0.47 356 SB-292 p357

cgtcgtgtcg t t-C3 1.94 357 SB-293 p358

cgTcgtgtcg t t-C3 1.02 358 SB-294 p359

cgtcgtgtcg T t-C3 2.43 359

Table 16 shows that phosphotriester insertions are tolerated in the immunostimulating polynucleotides.

TABLE 16 Polynucleotide Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) EC50(nM) SEQ ID NO: — p1 tcgtcgttttgtcgttttgtcgtt 170 — 1 — p246

cg t cgtgtcgtt-C3 104 — 246 SB-312 p361

cg T cgtgtcgtt-C3 102 0.67 361 SB-313 p362

cg T cgtgtcgTet-C3 175 0.85 362 SB-314 p363

cg T cgtgtcGett-C3 365 1.09 363 SB-315 p364

cg T cgtgtCegtt-C3 523 1.77 364 SB-316 p365

cg T cgtgTecgtt-C3 260 1.33 365 SB-317 p366

cg T cgtGetcgtt-C3 390 2.84 366 SB-318 p367

cg T cgTegtcgtt-C3 287 2.17 367 SB-319 p368

cg T cGetgtcgtt-C3 223 1.33 368 SB-320 p369

cg T Cegtgtcgtt-C3 242 0.76 369 SB-321 p370

cGe T cgtgtcgtt-C3 158 0.84 370 SB-322 p371

Ceg T cgtgtcgtt-C3 160 0.5 371 SB-323 p372

cgTecgtgtcg T t-C3 194 0.66 372

Tables 17 and 18 shows that abasic spacer insertions are tolerated in the immunostimulating polynucleotides.

TABLE 17 Poly- EC50  SEQ  nucleotide Sequence (5′ to 3′) (nM) ID NO: p371

Ceg T cgtgtcgtt-C3 189 371 p402

Ceg T cgtgtcGett-C3 356 402 p403

Ceg T cgtgtCegtt-C3 482 403 p404

Ceg T cgttgtcgTet-C3 203 404 p405

Ceg T cgtTegtcgTet-C3 809 405 p406

Ceg T cgTetgtcgTet-C3 510 406 p407

Ceg T cgtX3gtcgTet-C3 286 407 p408

Ceg T cgX3tgtcgTet-C3 266 408 p409

Ceg T cgtTegtcgTet-C3 875 409 p410

Ceg T cgtX3gtcgtt-C3 193 410 p361

cg T cgtgtcgtt-C3 102 361 p411 X3

cg T cgtgtcgtt-C3 124 411 p412

X3cg T cgtgtcgtt-C3 inactive 412 p413

cX3g T cgtgtcgtt-C3 225 413 p414

cgX3 T cgtgtcgtt-C3 131 414 p415

cg T X3cgtgtcgtt-C3 124 415 p416

cg T cX3gtgtcgtt-C3 85 416 p417

cg T cgX3tgtcgtt-C3 92 417 p418

cg T cgtX3gtcgtt-C3 93 418 p419

cg T cgtgX3tcgtt-C3 189 419 p420

cg T cgtgtX3cgtt-C3 227 420 p421

cg T cgtgtcX3gtt-C3 95 421 p422

cg T cgtgtcgX3tt-C3 135 422 p423

cg T cgtgtcgtX3t-C3 202 423 p424

cg T cgtgtcgttX3-C3 113 424

TABLE 18 Conjugate Conjugate Polynucleotide Sequence (5′ to 3′) EC50(nM) SEQ ID NO: SB-295 p373 t

cgtcgtgacgttX5-C3 44 373 SB-296 p374 t

cgtcgtgacgtX5t-C3 47 374 SB-297 p375 t

cgtcgtgacgX5tt-C3 103 375 SB-298 p376 t

cgtcgtgacX5gtt-C3 243 376 SB-299 p377 t

cgtcgtgaX5cgtt-C3 64 377 SB-300 p378 t

cgtcgtgX5acgtt-C3 29 378 SB-301 p379 t

cgtcgtX5gacgtt-C3 10 379 SB-302 p380 t

cgtcgX5tgacgtt-C3 7 380 SB-303 p381 t

cgtcX5gtgacgtt-C3 13 381 SB-304 p382 t

cgtX5cgtgacgtt-C3 13 382 SB-305 p383 t

cgX5tcgtgacgtt-C3 25 383 SB-306 p384 t

cX5gtcgtgacgtt-C3 19 384 SB-307 p385 t

X5cgtcgtgacgtt-C3 inactive 385 SB-308 p386 tX5

cgtcgtgacgtt-C3 28 386 SB-309 p387 X5t

cgtcgtgacgtt-C3 20 387 SB-310 p388 tucgx5cgtgacgtt-C3 8 388 SB-311 p389 tucgx5cgtgacgtt-C3 5* 389 SB-337 p313 t

cg t cgtgacgtt-C3 48 313 *sub-optimal activation

FIGS. 26A and 26B shows that the higher content of phosphorothioate-based internucleoside phosphotriesters influences the immunostimulating activity of immunostimulating polynucleotides. This effect is particularly pronounced in the immunostimulating polynucleotides having phosphorothioate-based internucleoside phosphotriesters disposed more distally from the 3′-terminus. The data shown in FIGS. 26A and 26B are summarized in Table 19.

TABLE 19 Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: SB-189 p246

cg t cgtgtcgtt-C3 0.35 246 SB-284 p347

cg t cgtgtcgtt-C3 2.46 347 SB-285 p348

cg t cgtgtcgtt-C3 4.92 348 SB-286 p349

cg t cgtgtcgtt-C3 3.74 349 SB-287 p350

cg t cgtgtcgtt-C3 1.98 350 SB-288 p351

cg t cgtgtcgtt-C3 0.80 351 SB-324 p390

cg T cgtgtcgtt-C3 3.9 390 SB-325 p391

Ceg T cgtgtcgtt-C3 3.9* 391 SB-322 p371

Ceg T cgtgtcgtt-C3 1.1 371 SB-327 p396

Ceg T CegtgtCegtt-C3 7.1* 396 SB-328 p397

cg T cGetGetcGett-C3 6.6** 397 SB-329 p398

cg T cgTegTecgTet-C3 5.6** 398 SB-330 p399

Ceg T cgTegTecgTet-C3 9.4** 399 SB-331 p400

cgTecgTegTecg T t-C3 7.9** 400 SB-326 p392

CeGe T cgtgtcgtt-C3 ca. 3.2** 392 *sub-optimal activation **inactive

Table 20 shows that longer linkers linking a targeting moiety to an immunostimulating polynucleotide may enhance the immunostimulating activity of the conjugate relative to a conjugate having a shorter linker.

TABLE 20 Conjugate Polynucleotide EC50 (nM) (PEGx)* SB-189 p246 0.3 23 SB-273 p246 2.7 11 SB-272 p246 3.1 7 SB-212 p246 3.1 3 SB-257 p246 0.2 23 SB-276 p246 1.2 11 SB-275 p246 1.9 7 SB-274 p246 3.1 3 *(PEGx) indicates the number of ethylene glycol units in the complementary reactive group attached to the antibody.

FIG. 27 shows that conjugation to an antibody heavy chain through Q-tag can provide conjugates exhibiting superior immunostimulating activity relative to conjugation to an antibody light chain through using PFP chemistry. The data shown in FIG. 27 are summarized in Table 21.

TABLE 21 EC50 Conjugate Antibody Polynucleotide Conjugation DAR* (nM) SB-099 rituximab p163 HC Q-tag 2 0.48 SB-107 rituximab p163 LC PFP 1 1.85 SB-107 rituximab p163 LC PFP 2 1.88 SB-107 rituximab p163 LC PFP 3 1.45 SB-107 rituximab p163 LC PFP 4 1.17 *DAR represents the polynucleotide/antibody ratio.

FIG. 28 shows that antibody heavy chain conjugates can exhibit superior immunostimulating activity relative to antibody light chain conjugates. The data shown in FIG. 28 are summarized in Table 22.

TABLE 22 Poly- EC50 Conjugate Antibody Conjugation nucleotide (PEGx)* (nM) — anti-CD38 — — — 0.6 SB-189 anti-CD38 HC Q-tag p246 23 0.9 SB-212 anti-CD38 HC Q-tag p246 3 0.4 SB-257 anti-CD38 LC Q-tag p246 23 >50 SB-274 anti-CD38 LC Q-tag p246 3 >50 *(PEGx) indicates the number of ethylene glycol units in the complementary reactive group attached to the antibody that is formed from NH₂-PEGx-N₃.

FIG. 29 shows that inclusion of auxiliary moieties (e.g., poly(ethylene glycol)s) can enhance the immunostimulating activity of a conjugate of the invention. The data shown in FIG. 29 are summarized in Table 23.

TABLE 23 Poly- EC50 Conjugate Antibody Conjugation nucleotide (PEGx)* (nM) SB-212 anti-CD38 HC Q-tag p246 PEG3 3.7 SB-218 anti-CD38 HC Q-tag p246 PP6 7.2 SB-278 anti-CD38 HC Q-tag p246 PP10 2.8 SB-279 anti-CD38 HC Q-tag p246 PP14 1.1 SB-280 anti-CD38 HC Q-tag p246 PP18 1.3 SB-281 anti-CD38 HC Q-tag p246 PP24 3.7 *(PEGx) indicates the complementary reactive group used in the conjugates.

Table 24 shows that the inclusion of PEG auxiliary moieties did not significantly influence the self-delivery of immunostimulating polynucleotides unconjugated to a targeting moiety. The data in Table 24 is for the IL6 secretion in A20 cells, as measured by ELISA, after 20 hours of incubation of the cells with the immunostimulating polynucleotides.

TABLE 24 Polynucleotide Sequence (5′ to 3′) (PEGx)* EC50 (nM) SEQ ID NO: p313 t

cg t cgtgacgtt-C3 PP12 111 313 p313 t

cg t cgtgacgtt-C3 PP16 139 313 p313 t

cg t cgtgacgtt-C3 PP20 123 313 p313 t

cg t cgtgacgtt-C3 PP26 96 313 p347 t

gctgctgagctt-C3 — 39 347 *(PEGx) indicates the complementary reactive group used in the conjugates.

FIG. 30 shows that auxiliary moieties can influence cellular dependent cytotoxicity of the conjugates. The data shown in FIG. 30 is summarized in Table 25.

TABLE 25 Poly- EC50 Conjugate Antibody Conjugation nucleotide (PEGx)* (nM) SB-218 anti-CD38 HC Q-tag p246 PP6 2.2 SB-278 anti-CD38 HC Q-tag p246 PP10 7.7 SB-279 anti-CD38 HC Q-tag p246 PP14 >100 SB-280 anti-CD38 HC Q-tag p246 PP18 47 SB-281 anti-CD38 HC Q-tag p246 PP24 0.5 *(PEGx) indicates the complementary reactive group used in the conjugates.

FIGS. 31 and 32 show the induction of IL6 in mouse A20 cells using conjugates containing truncated immunostimulating polynucleotides. The antibody utilized in these assays was a murine anti-CD20 antibody or murine anti-CD22 antibody. Q-tag was used for conjugation of the polynucleotides to the antibody. The data shown in FIGS. 31 and 32 are summarized in Table 26.

Table 26

¹ (PEGx) indicates the complementary reactive group used in the conjugates.

* indicates suboptimal activation.

TABLE 26 Conjugate Antibody Polynucleotide Sequence (5′ to 3′) (PEGx)¹ EC50 (nM) SEQ ID NO: SB-228 anti-CD20 p275

cg t cgtgacgtt-C3 PP6 21 275 SB-229 anti-CD20 p276

cg a cgtgacgtt-C3 PP6 13 276 SB-232 anti-CD20 p304

cgtcgtgacg t t-C3 PP6 53* 304 SB-233 anti-CD20 p305

cgacgtgacg t t-C3 PP6 42* 305 SB-224 anti-CD22 p275

cg t cgtgacgtt-C3 PP6 19 275 SB-225 anti-CD22 p276

cg a cgtgacgtt-C3 PP6 13 276 SB-230 anti-CD22 p304

cgtcgtgacg t t-C3 PP6 53* 304 SB-231 anti-CD22 p305

cgacgtgacg t t-C3 PP6 37* 305 SB-226 anti-CD22 p292

cgtcgtgacgt t -C3 PP6 45* 292 SB-227 anti-CD22 p293

cgacgtgacgt t -C3 PP6 39* 293 ¹(PEGx) indicates the complementary reactive group used in the conjugates. *indicates suboptimal activation.

FIG. 33A shows the induction of IL6 in mouse A20 cells using exemplary conjugates and an immunostimulating polynucleotide. The antibody utilized in these assays was a murine anti-CD22 antibody. Q-tag was used for conjugation of the polynucleotides to the antibody. The data shown in FIG. 33A are summarized in Table 27.

TABLE 27 Conjugate Polynucleotide Sequence (5′ to 3′) (PEGx)* EC50 (nM) SEQ ID NO: SB-266 p314 u

cg t cgtgacgtt-C3 PEG23 1.70 314 SB-277 p313 t

cg t cgtgacgtt-C3 PP8 1.40 313 — p313 t

cg t cgtgacgtt-C3 — 40.8 313 *(PEGx) indicates the complementary reactive group used in the conjugates. PEG23 is a complementary reactive group formed from NH₂-PEG23-N₃.

FIG. 33B shows that the activity of the immunostimulating conjugates is antagonized by the presence of the excess (0-10 fold) free antibody targeting the same receptor as that which is targeted by the antibody included in the immunostimulating conjugate. The IL6 secretion was used to assess the immunostimulating efficiency of the conjugates and unconjugated polynucleotides. These data indicate that (1) the targeting moiety improves the immunostimulating activity of the polynucleotides of the invention, and (2) the intracellular delivery of the immunostimulating polynucleotides in the conjugates of the invention is likely cell surface receptor-mediated. Accordingly, the enhancement in the immunostimulating activity of the conjugates relative to the unconjugated polynucleotides is likely due to the improvement in the intracellular delivery of the immunostimulating polynucleotides.

FIG. 34A shows the induction of interferon-α in human PBMC by CpG-2336, a class A CpG ODN. FIG. 34B shows the induction of interferon-α in human PBMC using conjugate SB-340. Anti-BDCA2 antibody, SB-341, and p246 were used as controls in this experiment. FIG. 34C shows the induction of interferon-α in purified plasmacytoid cells. The anti-BCDA4 antibody and its conjugate (SB-343) were used as controls.

FIGS. 35 and 36 show immunostimulating activities of polynucleotides with various 5′-modification and internucleoside triesters at 24 h, as measured by NFκB activation using QuantiBlue.

In Vivo Profiling in a Solid Tumor Model

A20 mouse B-cell lymphoma cells were purchased from the American Type Culture Collection (ATCC) and cultured in RPMI medium containing 10% FBS. On the day of experiment, the cells were harvested, re-suspended in HBSS and inoculated subcutaneously (5×10⁶ cells per mouse) into 6-8 week old female Balb/c mice (Charles River). After 10 days, the mice were randomized, each group having 8-10 mice were given three doses of the test article (an immunostimulating polynucleotide or a conjugate), every other day (Q2D), by either intratumoral (I.T., 25 μL) or intravenous (I.V., 100 μL) injection. Tumor volume was used to assess the treatment efficacy. Tumor volume was calculated twice per week using the formula: V=(L×W²)/2, where V is tumor volume, L is tumor length, and W is tumor width.

FIGS. 37A and 37B show that the treatment of a tumor with an immunostimulating polynucleotide of the invention can stop and even reverse the tumor growth. In these experiments, the immunostimulating polynucleotides of the invention were administered intratumorally or intravenously at times identified with arrows along the X-axes of the charts. These data also show that the conjugates are superior in their anti-tumor activity relative to the free individual components of the conjugates. The details of the in vivo profiling tests shown in FIG. 37B are provided in table 28.

TABLE 28 Sequence CpG SEQ ID Conjugate Antibody Polynucleotide (5′ to 3′) (PEGx)* mg/kg nmol Description NO: — — — — — — — Saline — muCD22 — — — 9 — Ab alone SB-339 muCD22 p346 t

c t gctgagctt-C3 23 10 0.9 control 346 SB-344 muCD22 p313 t

cg t cgtgacgtt-C3 PP16 10 0.9 — 313 SB-345 muCD22 p313 t

cg t cgtgacgtt-C3 PP12 10 0.9 — 313 — — p347 t

ctgctgagctt-C3 14.5 0.9 CpG alone 347 (μg/kg) *(PEGx) indicates the complementary reactive group used in the conjugates.

FIG. 38A shows that the treatment of a tumor with an immunostimulating polynucleotide of the invention can reduce tumor growth, as compared to unmodified immunostimulating polynucleotides or immunostimulating polynucleotides lacking a 5′-terminal ISS. In these experiments, the immunostimulating polynucleotides of the invention were administered intratumorally.

FIG. 38B shows the tumor volumes on day 20 after subcutaneous inoculation of the tested mice with A20 mouse B-cell lymphoma cells and subsequent intratumoral administration of three doses of saline, an immunostimulating polynucleotide of the invention, or an unmodified immunostimulating polynucleotide, as described above. In these experiments, the immunostimulating polynucleotides of the invention were administered intratumorally.

FIG. 39A shows that the intravenous administration of a conjugate of the invention can be as effective in treating a tumor as direct intratumoral administration of an unconjugated immunostimulating polynucleotide of the invention. Saline and unconjugated immunostimulating polynucleotides were administered intratumorally, and SB-337 was administered intravenously.

FIG. 39B shows the tumor volumes on day 20 after subcutaneous inoculation of the tested mice with A20 mouse B-cell lymphoma cells and subsequent administration of three doses of saline, an immunostimulating polynucleotide, or a conjugate, as described above. Saline and immunostimulating polynucleotides were administered intratumorally in three doses, and SB-337 was administered intravenously once.

In Vivo Profiling in a Liquid Tumor Model

A20 mouse B-cell lymphoma cells were purchased from the American Type Culture Collection (ATCC) and cultured in RPMI medium containing 10% FBS. On the day of experiment, the cells were harvested, re-suspended in HBSS and inoculated intravenously (5×10⁶ cells per mouse) into 6-8 week old female Balb/c mice (Charles River). Starting on the following day, 8-10 mice/group were given three doses of the test article (an immunostimulating polynucleotide or a conjugate), every other day (Q2D), by intravenous (I.V., 100 μL) injection. On day 47, the surviving mice were re-challenged with (5×10⁶ A20 cells per mouse). A new control group was added matching in age and size and was inoculated with A20 mouse tumor cells. Non-inoculated, non-treated littermates were included as controls. Survival rate (%) was monitored to assess the treatment efficacy.

FIG. 40 shows the survival rates for mice populations undergoing treatment with saline, conjugates of the invention, or immunostimulating polynucleotides. The details of the in vivo profiling tests shown in FIG. 40 are provided in table 29.

TABLE 29 CpG SEQ Poly- # of nmol/ ID Description Antibody nucleotide Sequence (5′ to 3′) (PEGx)* mg/kg doses dose NO: Saline — — — — — 3 — - muCD22 — — — 10 3 — - muCD22 — — — 3 3 — SB-337 muCD22 p313 t

cg t cgtgacgtt-C3 23 10 3 3 313 SB-337 muCD22 p313 t

cg t cgtgacgtt-C3 23 3 3 1 313 SB-338 muCD22 p313 t

cg t cgtgacgtt-C3 PP12 10 1 3 313 SB-339 muCD22 p346 t

gc t gctgagctt-C3 23 10 3 3 346 — — p347 t

gctgctgagctt-C3 — 3** 3 3 347 — — p18 tccatgacgttcctgacgtt — 3** 3 3 18 **μg/dose.

Example 4. Serum Stability of Immunostimulating Polynucleotides

Protocol: 1 μL of 2 mM stock solution (CpG polynucleotide having a phosphotriester) was placed in 19 μL of fresh mouse serum. 20 μL samples were placed in PCR plates and heated on thermocycler at 37° C. 2 μL sample removed at indicated time points, added to 18 μL of formamide loading buffer and frozen prior to gel analysis. 2 μL were loaded per well onto a 15% TBE-urea gel, 200 volts for 30 min followed by ethidium bromide staining (see FIGS. 41A and 41B). The stability of CpG polynucleotides containing phosphotriesters was also assessed in rat serum, monkey serum, and human serum (see FIGS. 41C, 41D, and 41E).

Serum Stability Analyses of Immunostimulating Polynucleotides by AEX HPLC:

An immunostimulating polynucleotide (40 μM in water) was diluted to a final concentration of 8 μM in 80% mouse serum. Aliquots were taken at specified time points (typically at 4 h, 24 h, and 48h) and quenched with 1:1 10 mM EDTA. Samples were analyzed by anion exchange HPLC on a DNAPac PA200, 4×250 mm column at 60° C. using mobile phase A: 20 mM sodium phosphate pH 8, 15% v/v isopropanol and mobile phase B: 20 mM sodium phosphate pH 8, 1.5 M sodium bromide, 15% v/v isopropanol; gradient of 20-98% mobile phase B in 10 minutes; 0.6 mL/min flow rate with detection at 260 nm. In the HPLC trace, the main peak was integrated for each time point, and % peak area relative to the non-aged sample was calculated. Same method was used to analyze the stability of the immunostimulating polynucleotides in rat serum, monkey serum, and human serum.

FIG. 42 shows that an immunostimulating polynucleotide containing an internucleoside phosphorothioate bonded to the 5′-terminal nucleoside exhibits higher serum stability than an immunostimulating polynucleotide containing an internucleoside phosphate bonded to the 5′-terminal nucleoside. As shown in Table 30, the immunostimulating polynucleotides having an internucleoside phosphate at the 5′-terminus can exhibit higher immunostimulating activity relative to the immunostimulating polynucleotides having an internucleoside phosphorothioate at the 5′-terminus, as measured by NFκB activation.

TABLE 30 Conjugate Polynucleotide Sequence (5′ to 3′) EC50 (nM) SEQ ID NO: — p1 tcgtcgttttgtcgttttgtcgtt 200 1 SB-189 p246

cg t cgtgtcgtt-C3 1.14 246 SB-188 p245

cg t cgtgtcgtt-C3 0.04 245

FIG. 43 shows that 5-iodouridine-containing immunostimulating polynucleotides can undergo degradation in serum over time through the loss of iodine, as determined through the observation of the increase in the HPLC peak area corresponding to the material with m/z that is less than the mass of the intact p246 by 127 Da.

FIG. 44 shows that 5-bromouridine can provide immunostimulating polynucleotides with the superior combination of serum stability and immunostimulating activity. The data shown in FIG. 44 is summarized in Table 31.

TABLE 31 Y-(PO/PS)-X- 

 -C3 Conjugate Polynucleotide X Y (PO/PS) EC50 (nM) SB-189 p246 Iodo-dU — PS 0.8  SB-217 p270 dT — PS >30**    SB-260 p311 dU — PS 37**   SB-253 p308 Bromo-dU — PS 2.3  SB-262 p306 Iodo-dU C3 PO 3.1** SB-270 p330 CF₃-dT — PO 2.0** SB-271 p331 CF₃-dT — PS inactive SB-250 p298 Iodo-dU dT PS 7.1** SB-251 p299 Iodo-dU Iodo-dU PS 7.7** SB-252 p300 Iodo-dU dU PS 5.1** SB-241 p307 Fluoro-dU — PS inactive **indicates suboptimal activation. Iodo-dU is 5-iodo-2′-deoxyuridine, dT is thymidine, dU is 2′-deoxyuridine, CF₃-dT is 5-trifluoromethyl-thymidine, Fluoro-dU is 5-fluoro-2′-deoxyuridine, and C3 is a C3 spacer —(CH₂)₃—OH.

FIG. 45 shows the stabilities of polynucleotides in sera (non-human primate (NHP), human, or mouse), as measured by the percentage of the remaining intact polynucleotide at predetermined time intervals. The data in FIG. 43 is summarized in Table 32.

TABLE 32 p246 p308 Hour NHP Human Mouse NHP Human Mouse 0 100 100 100 100 100 100 24 58.0 73.9 42.3 98.5 95.4 99.9 38 37.8 57.9 27.0 94.9 92.3 87.5 72 21.0 45.1 15.3 97.7 90.4 81.4 The values recited in this table are percentages of the intact polynucleotides measured at predetermined time intervals after the start of the incubation. Representative Examples of Human Immunostimulating Conjugates

TABLE 33 SB # Ab PP# Stretcher Tether CpG SB-205 human PP6 mono H 5-N₃- p239 CD38 valeramide SB-206 human PP6 mono H 5-N₃- p242 CD38 valeramide SB-351 human PP6 mono H 5-N₃- p243 CD38 valeramide SB-352 human PP6 mono H 5-N₃- p245 CD38 valeramide SB-218 human PP6 mono H 5-N₃- p246 CD38 valeramide SB-278 human PP10 mono CO-PEG08- 5-N₃- p246 CD38 NH₂ valeramide SB-279 human PP14 bis CO-PEG08- 5-N₃- p246 CD38 NH₂ valeramide SB-280 human PP18 bis CO-PEG08- 5-N₃- p246 CD38 NH₂ valeramide SB-281 human PP24 tris CO-PEG08- 5-N₃- p246 CD38 NH₂ valeramide SB-353 human PP10 mono CO-PEG08- 5-N₃- p308 CD38 NH₂ valeramide SB-354 human PP14 bis CO-PEG08- 5-N₃- p308 CD38 NH₂ valeramide SB-355 human PP18 bis CO-PEG08- 5-N₃- p308 CD38 NH₂ valeramide SB-356 human PP24 tris CO-PEG08- 5-N₃- p308 CD38 NH₂ valeramide Representative Examples of Murine Immunostimulating Conjugates

TABLE 34 SB # Ab PP# Stretcher Tether CpG SB-224 mouse PP6 mono H 5-N₃-valeramide p275 CD22Q SB-225 mouse PP6 mono H 5-N₃-valeramide p276 CD22Q SB-226 mouse PP6 mono H 5-N₃-valeramide p292 CD22Q SB-227 mouse PP6 mono H 5-N₃-valeramide p293 CD22Q SB-357 mouse PP6 mono H 5-N₃-valeramide p294 CD22Q SB-358 mouse PP6 mono H 5-N₃-valeramide p295 CD22Q SB-359 mouse PP6 mono H 5-N₃-valeramide p296 CD22Q SB-360 mouse PP6 mono H 5-N₃-valeramide p297 CD22Q SB-230 mouse PP6 mono H 5-N₃-valeramide p304 CD22Q SB-231 mouse PP6 mono H 5-N₃-valeramide p305 CD22Q SB-277 mouse PP8 mono H 5-N₃-valeramide p313 CD22Q SB-338 mouse  PP12 mono CO—PEG24—NH2 5-N₃-valeramide p313 CD22Q SB-344 mouse  PP16 bis CO—PEG24—NH2 5-N₃-valeramide p313 CD22Q SB-361 mouse  PP26 tris CO—PEG24—NH2 5-N₃-valeramide p313 CD22Q SB-362 mouse  PP38 mono CO—PEG24- 5-N₃-valeramide p313 CD22Q Tetrazine SB-363 mouse PP27 + mono CO—PEG24- 5-N₃-valeramide p313 CD22Q TCO* Tetrazine SB-364 mouse PP29 + bis CO—PEG24- 5-N₃-valeramide p313 CD22Q TCO* Tetrazine SB-365 mouse PP39 + bis CO—PEG24- 5-N₃-valeramide p313 CD22Q TCO* Tetrazine SB-366 mouse PP39 + tris CO—PEG24- 5-N₃-valeramide p313 CD22Q TCO* Tetrazine *TCO is trans-cyclooctenyl-based group bonded to a targeting moiety. TCO has a structure illustrated in FIG. 1B.

Example 5

This Example shows that the CpG polynucleotides conjugated to antibodies (CpG-Abs) provided herein are efficacious in the treatment of various liquid and solid tumors. Specifically B-cell targeted CpG-Abs can affect the innate and adaptive immune responses in a subject with cancer. Such B-cell targeted CpG-Abs can be useful for the treatment of non-B-cell tumors (e.g., colon carcinoma), including of tumors not expressing the CpG-Ab target (e.g., CD22) and not expressing the target of the CpG-Ab immunomodulating polynucleotide (e.g., TLR9 agonist). In addition CpG-Abs targeted to non-B-cell antigen presenting cells (APCs), such as plasmacytoid dendritic cells or macrophages, are useful in the treatment of liquid tumors (e.g., lymphoma). Broad antitumor efficacy of CpG-Abs was observed following their systemic administration to a subject. The anti-tumor effect of CpG-Abs, including of B-cell targeted CpG-Abs was found to involve cell mediated immunity and to be dependent on a host's T-cell function such as CD8+ T-cell function. CpG-Abs including, for example, B-cell targeted CpG-Abs increased CD4+ and CD8+ T-cell infiltration of solid tumors. Moreover, CpG-Abs were found to provide adaptive and long-lasting anti-tumor immunity. Synergistic effects with checkpoint inhibitors, such as anti-PD1 antibodies and anti-PD-L1 antibodies were observed. CpG-Ab were designed to have a clean complement profile, and, e.g., not to activate complement C3.

Example 6. B-Cell Targeting CpG-Ab Conjugate is Efficacious in Treating Disseminated (Liquid) B-Cell Lymphomas

A disseminated (liquid) B-cell lymphoma disease model was created by intravenous injection of immune competent BALB/c mice (8-10 mice/group) with A20 lymphoma cells (TLR9*/CD22*). Test compounds were administered intravenously on days 1, 3 and 5 post cell injection and animal survival was monitored for 40 days.

An immunostimulating polynucleotide was synthetized and conjugated to a mouse-anti-CD22 monoclonal antibody (mAb) as described in Examples 1 and 2 above. This conjugate (SB-337 as shown in Table 6-A) is referred to as CpG-mAb (CD22) in the following examples. A synthetic polynucleotide replacing the CpG dinucleotide with GpC dinucleotides was similarly made and conjugated to the anti-CD22 mAb to serve as a control conjugate (SB-339) in the following experiments.

Mice were injected with A20 lymphoma cells on Day 0 as described above. Then, on Day 1, 3 and 5 each, mice were given intravenous injections of (i) 3 mg/kg CpG-mAb (CD22); (ii) 10 mg/kg CpG-mAb (CD22); (iii) unconjugated CpG (p347 as shown in Table 2); (iv) 10 mg/kg CD22 mAb (CD22); or (v) 10 mg/kg GpC-mAb (control conjugate). Additionally, a negative control group received only saline solution on Day 1, 3 and 5. Survival rates of the groups were monitored for 40 days.

As shown in FIG. 46B, mice treated with CpG-mAb had significantly longer survival as compared to the negative control group. The treatment exhibited dosage dependent effect. Particularly, the group receiving 10 mg/kg CpG-mAb (CD22) sustained 100% survival rate within the 40-day observation window, slightly better than the outcome of the group receiving 3 mg/kg CpG-mAb (CD22), which sustained 90% survival rate.

Further, treatment with naked CpG ODN or anti-CD22 mAb alone also prolonged group survival as compared the negative control group receiving solely the saline solution, although both groups died off within the 40-day observation window. Treatment with the GpC-mAb control also prolonged group survival as compared to the negative control, which effect may be attributable to the anti-CD22 mAb component of the control conjugate.

These data suggest that CpG ODN and CpG-Ab conjugates containing the CpG ODN and an antibody targeting a B cell surface antigen as provided herein are efficacious in treating disseminated B-cell lymphomas.

Next, survivors from the first tumor challenge were subjected to a second tumor challenge on Day 47. Particularly, a second dose of A20 lymphoma cells (5×10⁶ cells) was injected intravenously into survivors that were treated with 10 mg/kg or 3 mg/kg CpG-mAb (CD22) on Days 1, 3 and 5. A naive control group was given the same dose of A20 lymphoma cells on Day 47. Survival rate of the group of mice were continued to be monitored for 43 days (i.e., 90 days in total after the first tumor challenge).

As shown in FIG. 46C, consistent with the outcome of the first tumor challenge, the naive control group also died off within 40 days after they received the A20 cells on Day 47 (i.e., died off around Day 85). Both the 10 mg/kg and 3 mg/kg treatment groups exhibited significantly better survival rates than the control group. Particularly, as shown in FIG. 46C, the 10 mg/kg treatment group maintained 100% survival rate, and the 3 mg/kg treatment group maintained 60% survival rate at the end of the 90-day observation window, even though the mice did not receive any treatment after the last dose of CpG-mAb (CD22) on Day 5.

Next, the prolonged anti-tumor effect was further monitored after the survivors from the first and second tumor challenges were subjected to a third tumor challenge. Particularly, a solid B-cell lymphoma disease model was created in the survivor mice by implanting 5×10⁶ A20 lymphoma cells (TLR9⁺/CD22⁺) subcutaneously on the mouse shoulder on Day 90. A naive control group was implanted with the same dose of A20 lymphoma cells on Day 90. The sizes of the tumor engraftments were monitored for 30 days (i.e., between Day 90 and Day 120).

Particularly, as shown in FIG. 46D, the tumor volume increased rapidly in the control group, reaching a size above 3000 mm³ within 20 days. In contrast, the survivor group remained tumor free throughout the 30-day observation period, even though the survivors did not receive any additional treatment after the last dose of CpG-mAb (CD22) on Day 5. These experiments indicates that soluble tumor survivors also survived solid tumor challenge. The survivors acquired anti-tumor immunity that strongly inhibited new tumor engraftments later on.

Taken together, these data suggest that the CpG-Ab conjugates provided herein are capable of inducing sustained adaptive immunity against tumor in a subject.

Example 7. B-Cell Targeting CpG-Ab Conjugate is Efficacious in Treating Solid B Cell Lymphomas

A solid B-cell lymphoma disease model was created by implanting 5×10⁶ A20 lymphoma cells (TLR9*/CD22*) in immune competent BALB/c mice. The cells were injected subcutaneously on the mouse shoulder and tumor growth was monitored. The CpG-mAb (CD22) conjugate and the GpC-mAb control conjugate were made as described above.

Mice were implanted with A20 lymphoma cells on Day 0 as described above. Then, on Day 9, 12 and 14 each, mice were given intravenous injections of (i) 3 mg/kg CpG-mAb (CD22); (ii) 10 mg/kg CpG-mAb (CD22); (iii) naked CpG ODN; (iv) 10 mg/kg CD22 mAb (closed square); or (v) 10 mg/kg GpC-mAb (control conjugate). Additionally, a negative control group received only saline solution on Day 9, 12 and 14. Tumor volumes of the groups of mice were monitored for 23 days. The results are shown in FIGS. 47B to 47E.

As shown in FIG. 47B, mice treated with CpG-mAb (CD22) had significantly smaller tumor volume as compared to the negative control group. Tumor volumes of all mice treated with CpG-mAb (CD22) remained under 2000 mm³ at the end of the 25-day period. The treatment exhibited dosage dependent effect. Particularly, the group receiving 10 mg/kg CpG-mAb (CD22) had smaller tumor volume at the end of the 25-day period as compared to the group receiving 3 mg/kg CpG-mAb (CD22). Further, treatment with naked CpG ODN alone also resulted in significantly smaller tumor volumes than the negative control group, with the tumor volume remaining under 2000 mm³ for at least 20 days. Taken together, these data suggest that CpG ODN and CpG-Ab conjugates containing the CpG ODN and an antibody targeting a B cell surface antigen are efficacious in treating solid B-cell lymphomas. The effect of CpG-mAb (CD22) conjugates on the weights of mice were also studies and the results are shown in FIG. 47F.

Example 8. B-Cell Targeting CpG-Ab Conjugate is Efficacious in Treating Non-B Cell Carcinomas

A colon carcinoma disease model was created by implanting 0.2×10⁶ CT26 cells (CD22-/PD-L1(low)/TLR9-) subcutaneously on the flank of immune competent BALB/c mice. The CpG-mAb (CD22) conjugate was made as described above.

Mice were implanted with CT26 cells on Day 0 as described above. Then, the mice were given intravenous injections of (i) CpG-mAb (CD22) alone; (ii) anti-PD-1 antibody alone; (iii) CpG-mAb (CD22) in combination with anti-PD-1 antibody; or (iv) saline solution. Particularly, 3 mg/kg CpG-mAb (CD22) was initially injected on Day 5, and the dosing was repeated on Day 8 and Day 11. 10 mg/kg Anti-PD-1 was initially injected on Day 6, and the dosing repeated on Day 9 and 12. Tumor volumes of the groups of mice were monitored for 18 days.

As shown in FIG. 48B, treatment with CpG-mAb (CD22) or anti-PD-1 alone, or the two agents in combination all reduced the tumor volume significantly at the end of the observation period as compared to the control group. The anti-tumor effect of the combination treatment was more prominent than treatment with anti-PD-1 alone.

Taken together, these data together suggest that systematic administration of the B-cell targeting CpG-mAb (CD22) conjugate is efficacious for treating solid tumors, even though the solid tumors cells themselves do not express TLR9 or the antigen target of the CpG-mAb (CD22) conjugate. The anti-tumor effect can be attributed to B-cell activation upon administration of the B-cell targeting CpG-mAb (CD22) conjugate. Furthermore, a combination therapy using both an anti-PD-1 antibody and a B-cell targeting CpG-mAb (CD22) conjugate is more efficacious in treating the solid tumor as compared to treatment with the anti-PD-1 antibody alone.

Example 9. Anti-Tumor Effect of CpG-Ab Conjugate in Competent Immune Systems

Next, experiments were performed to evaluate anti-tumor effect of CpG-Ab conjugates in immuno-competent and immuno-compromised systems. Solid B-cell lymphoma models were created by implanting 5×10⁶ A20 lymphoma cells (TLR9⁺/CD22⁺) in immune competent BALB/c mice and immuno-compromised Nu/Nu mice and SCID mice, respectively. The CpG-mAb (CD22) conjugate was made as described above.

T-cell B-cell NK Cell Strain immunity Immunity Immunity Balb/C + + + Nu/Nu − + + SCID − − +/−

In the immuno-competent group, 10 mg/kg CpG-mAb (CD22) was administered intravenously on Days 10, 12 and 14. A negative control group received intravenous injection of only saline solutions on the above days. Tumor volumes were monitored for 20 days. As shown in FIG. 49A, intravenous administration of CpG-mAb (CD22) resulted in the tumor-free phenotype in the immune-competent Balb/C mice, while the tumor volume of the control group continued to increase during the observation period.

In the immuno-compromised groups, 10 mg/kg CpG-mAb (CD22) or naked CpG was administered intravenously on Days 8 and 11. A negative control group received i.v. injection of only saline solutions on the above days. Tumor volumes were monitored for 15 days. As shown in FIGS. 49B and 49C, i.v. administrations of the naked CpG ODN or the CpG-mAb (CD22) conjugate did not affect tumor growth in the immune-compromised Nu/Nu mice or SCID mice, as compared to the negative control group.

Taken together, these data suggest that the anti-tumor effect of the CpG-Ab conjugate is dependent upon T-cell immunity.

Example 10. Anti-Tumor Effect of CpG-Ab Conjugate is CD8⁺ T-Cell Dependent

Next, experiments were conducted to examine activities of lymphocyte that are required for the anti-tumor effect of the CpG-Ab conjugates. Particularly, anti-tumor effects of the CpG-Ab conjugates were evaluated in CD4+ T cell depleted mice, CD8+ T cell depleted mice, and NK cell depleted mice which was achieved by intraperitoneal injection of anti-CD4 antibody (500 ug/mouse on days −2, −1, 0, 5, 8, 12), anti-CD8 antibody (100 ug/mouse on days −2, −1, 0, 5, 8, 12), or anti-asialo GM1 antibody (25 ug/mouse on days −2, −1,0, 5, 8, 12), respectively. Cell depletion was confirmed by FACS analysis. All depletion antibodies were purchased from Bioexcell.

Disseminated B-cell lymphoma model mice were created as described above. The CpG-mAb (CD22) conjugate was made as described above.

In these lymphocyte depletion experiments, mice were injected with A20 lymphoma cells (5×10⁶) on Day 0 as described above. Then, on Day 1, 3 and 5 each, mice were given intravenous injections of (i) 3 mg/kg CpG-mAb (CD22) and anti-CD4 depletion antibody, 500 ug/mouse on days −2, −1, 0, 5, 8, 12 to deplete CD4+ T cell); (ii) 3 mg/kg CpG-mAb (CD22) and 25 ug/mouse of anti-asialo GM1 antibody on days −2, −1, 0, 5, 8, 12 to deplete NK cells; and (iii) 3 mg/kg CpG-mAb (CD22) and anti-CD8 depletion antibody, 100 ug/mouse on days −2, −1, 0, 5, 8, 12 to deplete to deplete CD8+ T cells. Additionally, a positive control group received 3 mg/kg CpG-mAb (CD22) on Day 1, 3, and 5, and a negative control group received only saline solution on Day 1, 3 and 5. Survival rates of the groups were monitored for 85 days.

As shown in FIG. 50A, mice received CpG-mAb (CD22) treatment showed significantly better survival as compared to the groups not treated with CpG-mAb (CD22). CD4+ T cell depletion did not significantly affect survival. Particularly, the two groups of mice treated with CpG-mAb (CD22) (with and without the T-cell depletion treatment) both maintained 50% survival rate for at least 85 days after challenged with tumor cells, while the two groups of mice without CpG-mAb (CD22) treatment (with and without the T-cell depletion treatment) both died off within 40 days.

Depletion of NK cells or CD8+ cells both resulted in worse survival in mice treated with CpG-mAb (CD22). As shown in FIG. 50B, the group receiving both CpG-mAb (CD22) and NK cell depletion treatments exhibited about 90% survival rate on Day 40, and about 10% survival rate on Day 85. More prominently, as shown in FIG. 50C, more than 90% CD8+ T cell depleted mice died within 30 days even after CpG-mAb (CD22) treatment. This result was similar to the outcome observed in the control group (where all mice died around Day 30). These data suggest that the anti-tumor effect CpG-Ab is at least CD8+ T cell dependent.

Example 11. CpG-Ab Conjugate Increases T-Cell Tumor Infiltration

Solid B-cell lymphoma model mice were created as described above. The CpG-mAb (CD22) conjugate was made as described above.

Mice received intravenous administration of 10 mg/kg CpG-mAb (CD22) conjugate 10, 12 and 14 days after challenged with A20 lymphoma cells subcutaneously on day 0. Tumors harvested on Day 17 were subsequently digested by incubation in digestion buffer containing 1 mg/mL collagenase IV, 100 U/mL DNAse I in HBSS at 37° C. for 30 min. Then, the digested cells were filtered through a 70 um sieve, washed, incubated on ice with anti-CD4-PE or anti-CD8-PE antibodies and analyzed by FACS.

As shown in FIG. 51A, tumor growth was slower in the group treated with CpG-mAb (CD22) as compared to the control group. The tumor volume on Day 17 from CpG-mAb (CD22) treated mice was significantly smaller than the control mice. As shown in FIG. 51B, percentages of CD4+ cells and CD8+ cells in tumor tissue were both significantly higher in the treated group than the control group, Further, as shown in FIG. 51C, the tumor volume inversely correlates with the percentage of CD8+ cells in the tumor.

Taken together, these data suggest that systemic administration of CpG-Ab conjugates into mice having a solid tumor can significantly increase T-cell infiltration into the tumor. The increased number of immune cells, particularly CD8+ T cells, in the tumor and/or tumor microenvironment facilitates immune attacking on the tumor and inhibitors of tumor growth.

Example 12. Synergistic Effect of CpG-Ab Conjugates and Antibodies of Immune Checkpoint Proteins

Experiments were performed to evaluate the anti-tumor effect of combination therapy using both CpG-Ab conjugates and an immune checkpoint protein antibody.

Solid B-cell lymphoma model mice were created as described above. The CpG-mAb (CD22) conjugate was made as described above. Anti-PD1 antibody (clone J43) was purchased from Bioxcell and anti-PDL1 antibody (atezolizumab) was made in house.

Mice were implanted with A20 lymphoma cells on Day 0 as described above. Then, the mice were given intravenous injections of (i) CpG-mAb (CD22); (ii) intraperitoneal injection of anti-PD-1 antibody or anti-PD-L1 antibody; (iii) CpG-mAb (CD22) in combination with the anti-PD-1 antibody or CpG-mAb (CD22) in combination with the anti-PD-L1 antibody; or (iv) saline solution. Particularly, for the groups receiving CpG-mAb (CD22) (alone or in combination with the immune checkpoint protein antibody), a first dose of 3 mg/kg CpG-mAb (CD22) was initially administered on Day 10, and then the same dosing was repeated on Day 12 and 14. Additionally, for the groups receiving an immune checkpoint protein antibody (alone or in combination with CpG-mAb (CD22)), a first dose of 10 mg/kg immune checkpoint protein antibody was initially administered on Day 10, and then the same dosing was repeated on Day 13 and 16. Tumor volumes of the group of mice were monitored.

It was observed from this experiment that CpG-mAb (CD22) and the immune checkpoint protein antibody synergistically produced a stronger tumor-inhibiting effect as compared to treatment with either of the two agents separately. Particularly, as shown in FIGS. 52A and 52B, mice treated with the combination therapy had significantly smaller tumor size as compared to treatment with CpG-mAb (CD22) or the immune checkpoint antibody alone.

To examine whether the observed synergistic effect is also dependent on CD8+ T cell activity, an additional group of mice was given (i) 10 mg/kg CpG-mAb (CD22) on each of Days 10, 12 and 14, (ii) 10 mg/kg anti-PD-1 antibody on each of Days 10, 13 and 16, and (iii) antiCD8 antibody (200 ug/mouse, intraperitoneal, starting on days 0 and dosed twice/week throughout the experiment to deplete CD8+ T cells. As shown in FIG. 52C, like the saline treated control group, the tumor volume of this experimental group increased rapidly, suggesting the synergistic effect in inhibiting tumor growth of the combination therapy using both CpG-mAb (CD22) and an immune checkpoint protein antibody is also CD8+ T cell dependent.

Further, mice treated with the combination therapy using both CpG-mAb (CD22) and anti-PD-1 antibody and survived the first tumor challenge were subjected to a second tumor challenge. Particularly, survivors from the combination treatment group was given a second dose of A20 cells subcutaneously on the shoulder on Day 30. The survivor group did not receive any additional treatment after the second tumor challenge. A naive control group was given the same dose of tumor cells. The tumor volume was further monitored for 25 days (i.e., between Day 30 and Day 55).

As shown in FIGS. 53A through 53C, in contrast to the control group or the group treated with anti-PD-1 antibody alone, the CpG-Ab/anti-PD-1 combination significantly inhibited tumor growth in all individuals throughout the observation period. Further, the combination treatment regressed staged tumors in two individuals starting around D18.

The survivors from the combination treatment group were subjected to the second tumor challenge as described above. As shown in FIG. 53D, after the second tumor challenge, the tumor volume in the naive control group increased rapidly, reaching an average volume above 2000 mm³ within 20 days. In contrast, the survivor group remained tumor free throughout the 25-day observation window. These results suggest that the combination therapy using the CpG-Ab conjugate and an immune checkpoint protein antibody can induce sustained adaptive immunity against tumor in a subject.

Example 13. Synergistic Effect of CpG-Ab Conjugates and T Cell Agonists

Next, Experiments were performed to evaluate the anti-tumor effect of combination therapy using both CpG-Ab conjugates and a T cell agonist.

Solid B-cell lymphoma model mice were created as described above. The CpG-mAb (CD22) conjugate was made as described above.

Mice were implanted with A20 lymphoma cells on Day 0 as described above. Then, the mice were given intravenous injections of (i) CpG-mAb (CD22); (ii) intraperitoneal injection of anti-OX-40 antibody (clone OX-86, 10 mg/kg, Bioxcell), anti-ICOS antibody (clone 7E.17G9, 10 mg/kg, Bioxcell), or anti-4-1BB antibody (clone 3H3, 1 mg/kg, Bioxcell); (iii) CpG-mAb (CD22) in combination with anti-OX-40 antibody, CpG-mAb (CD22) in combination with anti-ICOS antibody, or CpG-mAb (CD22) in combination with anti-4-1 BB antibody; or (iv) saline solution. Particularly, for the group receiving CpG-mAb (CD22) (alone or in combination with a T-cell stimulatory antibody), a first dose of 3 mg/kg CpG-mAb (CD22) was initially administered on Day 10, and then the same dosing was repeated on Day 12 and 14. Additionally, for the group receiving a T-cell stimulatory antibody (alone or in combination with CpG-mAb (CD22)) a first dose of the T-cell stimulating antibody was administered on Day 10, and then the same dosing was repeated on Day 13 and 17. Tumor volumes of the group of mice were monitored.

It was observed from this experiment that CpG-mAb (CD22) and the T-cell stimulatory antibody synergistically produced a tumor-inhibiting effect that was not observed in treatment with the T-cell stimulatory antibody alone. Particularly, as shown in FIGS. 54A through 54C, mice treated with the combination therapy had significantly smaller tumor size as compared to the negative control group or the group treated with the T-cell stimulatory antibody (anti-OX-40, anti-ICOS, or anti-4-1 BB) alone.

Example 14. B-Cell Targeting CpG-Ab Elicits Tumor Antigen Specific Cytotoxic T-Cell Response in Splenocytes

A colon carcinoma disease model was created by as described above. The CpG-mAb (CD22) conjugate was made as described above.

Mice were implanted with CT26 cells on Day 0 as described above. Then, the mice were given intravenous injections of 10 mg/kg CpG-mAb (CD22) or saline solution on Days 10, 13, and 16. Tumor volumes of the groups of mice were monitored for 17 days. As shown in FIG. 55A, treatment with the CpG-mAb (CD22) significantly inhibited tumor growth as compared to the control group.

On Day 17 (24 hours after the last dose), the mice were sacrificed, the splenocytes were isolated and plated (4×10⁵ cells/well) in ELISPOT plates coated with anti-IFN-gamma antibody. The cells were challenged with a CT26 cell surface antigen (AH1 peptide) at 100 ug/ml for 24 hours at 37° C. and the IFN-gamma secreting T cells were counted. As shown in FIG. 55B, the number of IFN-gamma secreting cells significantly increased in the group treated with CpG-mAb (CD22) as compared to the control. These data suggest that the B-cell targeting CpG-Ab conjugate is capable of eliciting tumor antigen specific cytotoxic T-cell response upon administration to a subject.

Example 15. CpG-Ab Conjugates Targeting Dendritic Cells Elicit Anti-tumor Adaptive Immunity

A solid B-cell lymphoma disease model was created by as described above. Immunostimulating polynucleotide having the sequence of SEQ ID NO: 313 (p313) was synthetized and conjugated to an anti-CD205 antibody or an anti-PD-L1 antibody as described in Examples 1 and 2. These conjugates are referred to as CpG-Ab (CD205) and CpG-Ab (PD-L1), respectively.

Mice were implanted with A20 cells on Day 0 as described above. Then, the mice were given intravenous injections of (i) 10 mg/kg CpG-Ab (CD205); (ii) 10 mg/kg CpG-Ab (PD-L1); or (iii) saline solution, on Days 10, 12, and 14. Tumor volumes of the groups of mice were monitored for about 41 days.

As shown in FIG. 56A, treatment with the CpG-Ab (CD205) significantly inhibited tumor growth as compared to the control group. As further shown in FIG. 56B, the CpG-Ab (CD205) conjugate regressed tumor growth in all 8 individuals in the group, and resulted in the tumor-free phenotype in 7 out of the 8 individuals in total.

As shown in FIG. 56C, treatment with the CpG-Ab (PD-L1) regressed tumor growth and resulted in the tumor-free phenotype in 3 out of the 8 individuals in total.

Furthermore, survivors from the groups treated with the CpG-Ab conjugates were subjected to a second tumor challenge. Particularly, survivors were given 5×10⁶ of A20 cells subcutaneously on Day 37 without further treatment. A naive group of mice having solid B-cell lymphoma were given the same dose of A20 cells. The tumor volume of the groups of mice were observed for 17 days after the second challenge. As shown in FIG. 56D, the tumor volume increased rapidly in the control group, while survivors from the CpG-Ab (PD-L1) treatment group or CpG-Ab (CD205) treatment group remained tumor-free throughout the 17-day observation window.

In a separate experiment, four groups of mice having solid B-cell lymphoma (8 individuals/group) were treated with intravenous doses of (i) 10 mg/kg CpG-Ab (CD205) conjugate; (ii) 10 mg/kg mouse anti-CD205 monoclonal antibody; (iii) 10 mg/kg rat IgG, or (iv) saline solution, on each of Days 10, 12, and 14. The tumor volume of the groups of mice were monitored for 27 days.

As shown in FIGS. 57A and 57C, treatment with the CpG-Ab (CD205) conjugate regressed tumor growth and eventually resulted in the tumor-free phenotype in all 8 individuals of the treatment group. Also, tumors regressed in mice treated with anti-DEC205 antibody and rat IgG control antibody. This is perhaps due to the fact that both antibodies, as IgG2, possess an active Fc effector function which resulted in moderate anti-tumoral activity, although none of the mice were tumor free. Thus, despite the fact that the anti-DEC205 antibody showed anti-tumoral activity, the CpG-CD205 conjugate was significantly more efficacious as all the mice were tumor free.

Taken together, these data suggest that CpG-Ab conjugates targeting dendritic cells can elicit sustained adaptive immunity against tumor upon administration to a subject.

Example 16 CpG-CD19 Conjugates Show Good Efficacy

A solid B-cell lymphoma disease model was created by implanting 4×10⁶ A20 lymphoma cells in mice, as described above. Briefly, the cells were injected subcutaneously and tumor growth was measured using a caliper. The CpG-mAb conjugate and the naked CpG were made as described above.

Mice were implanted with A20 lymphoma cells on Day 0. Mice were staged for 10 days and then treated on Day 10, 12 and 14, and tumor growth was measured until Day 20 (FIG. 60A). Treatment included intravenous injections of (i) 3 mg/kg CpG-Ab (SB-337; p313 conjugated to CD22) (square); (iii) 3 mg/kg anti-CD19 (down closed triangle); (iv) 3 mg/kg CpG-Ab (SB-388; p313 conjugated to CD19) (closed diamond); (v) 1.9 μg/mouse free CpG (p347) (up triangle); (vi) 19 μg/mouse free CpG (p347) (down open triangle); or (vii) 190 μg/mouse free CpG (p347) (open diamond). Additionally, a negative control group received only saline solution (closed circle). Tumor volumes of the groups of mice were measured using a caliper starting at Day 10, and continued until Day 20 (FIG. 60A). On Day 20, the mice were sacrificed and the tumor volume was measured (FIG. 60B). The results indicated that the CpG-Ab conjugate (SB-388) that contained p313 conjugated to CD19 displayed good efficacy, and the efficacy was similar to the CpG-Ab conjugate (SB-337) that contained the same CpG (p313), but was conjugated to CD22.

In addition, the body weight change of the mice, discounting the change in tumor weight, was assessed (FIG. 60C). The preliminary safety results indicated that the CD19 CpG-Ab (SB-388) was less toxic than its equivalent dose of CpG, based on the body weight change.

In the current and following examples, CpG-4715 corresponds to p347 as shown in Table 2; CpG-4523 corresponds to p313 as shown in Table 2. SB-1490 corresponds to SB-337 as shown in Table 6-A; and SB-3055 corresponds to SB-388 as shown in FIG. 6-B.

Example 17 Intratumoral Dosing of CpG4715 in Solid Tumors is Efficacious

To assess the intratumoral dosing of CpG in solid tumors, albino C57B1I/6 mice (n=8/group) were inoculated subcutaneously on the flank with 1×10⁶ B16F10 melanoma cells. The tumors were allowed to grow for seven days, and then p347 was injected intratumorally (30 μg in 50 μL of saline) on days 7, 9, 11, and 13. As a negative control, 50 μL of saline was injected intratumorally in the saline treated group. Tumor volumes were monitored until day 27. The results indicated that p347 is efficacious in solid tumor types, as indicated by the smaller tumor volume in mice treated with p347, relative to saline (FIG. 61A).

In addition, the systemic effect of the CpG was monitored by re-challenging the B16F10 melanoma cells into the mice by injecting 1×10⁶ B16F10 melanoma cells intravenously into the tail vein on day 14. Tumor volumes were monitored until day 27, whereupon the mice were sacrificed and their lungs were excised to assess tumor metastases. The results revealed that upon re-challenging the mice by injecting non-treated melanoma cells into the tail vein, there were less lung metastases in the p347 treated group compared to the saline treated group (FIG. 61B). Collectively, these results indicated that CpG provides a systemic effect, and the prolonged effect from immune activation is able to reduce the total number of metastases to the lung.

To determine the mechanism of action pertaining to the systemic effect more carefully, the CT-26 colorectal mouse model was employed, as described above. Briefly, the tumors were allowed to grow for seven days, and then p347 was injected intratumorally (10 μg in 50 μL of saline) on days 7, 10, 12, and 14. As a negative control 50 μL of saline was injected intratumorally in the saline treated group. The tumor volumes were monitored until day 21 (FIG. 61C). In agreement with the B16F10 melanoma model, intratumor dosing of CpG4715 was efficacious in CT26 solid tumors. Importantly, the results indicated host TLR9 is sufficient for function of CpG treatment, since CT26 cells are TLR9-.

Example 18 Anti-Tumor Effect of CpG-Ab Conjugate is B-Cell Dependent

Experiments were performed to evaluate the role of B cells on the activity of CpG. To this effect, the CT26 colorectal model was used, as described above, in Jh knockout mice that are genetic B-cell deficient (Igh-J^(tm1Dhu)N?+N2; Taconic Biosciences, Inc) (FIG. 62A). These mice have a deletion of the endogenous murine J segments of the Ig heavy chain locus, resulting in the cells of the B lineage being drastically altered both in developmental progression and in cell quantity. The mice contain no mature (immunoglobulin-bearing) B-lymphocytes in the spleen, bone marrow, lymph nodes, peripheral blood or peritoneum, and they have no detectable IgM or IgG in the sera.

CT26 xenografts were created, as described above. The tumors were grown for seven days, and then mice were treated intravenously with 10 mg/kg CpG-mAb (CD22-CpG; SB-337), or saline on days 10, 12, and 14 (FIG. 62A). The tumor volume was monitored for 17 days, with no significant difference being observed between the saline and CpG-mAb groups. This indicated that B-cells are required for CpG activity.

The results were further supported using a CT-26 colorectal model in a mouse background that had B-cells depleted by administering mice immunocompetent mice with anti-CD20 mAb (FIG. 62B). The tumor volume was measured for 27 days. The anti-tumor effect of the CpG-mAb treatment group was significantly reduced as compared to treatment without B cell depletion. This result further supported that CpG activity is B-cell dependent.

Example 19 B-Cell Activation Enhances CpG Anti-Tumor Activity in Syngeneic Mouse Models

A syngeneic model of colorectal cancer was performed using MC38 colorectal cancer cells to assess the effect of B-cell activation on CpG anti-tumor activity. MC38 colorectal cancer cells are antigen/TLR9 negative. Briefly, albino female C57B1I/6 mice (n=8/group) were inoculated subcutaneously on the flank with 0.3×10⁶ MC38 cells. The xenografts were grown for 10 days, and then the test compounds were injected with (i) saline solution (circle); (ii) 10 mg/kg anti-CD22 (upward triangle); (iii) 10 mg/kg anti-PD-L1 (downward triangle); (iv) 10 mg/kg CD22-CpG (SB-337) (square); or (v) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD-L1 (diamond). Anti-CD22 and CD22-CpG were dosed intravenously on Days 10, 12, and 14; anti-PD-L1 was dosed intraperitoneally on Days 10, 13, and 17 (FIG. 63A). The tumor volumes were monitored until day 17 (FIG. 63A).

The results indicated that treatment with 10 mg/kg CD22-CpG (SB-337) (square) significantly reduced the tumor volume, relative to saline treatment (FIG. 63A). Similarly, treatment with 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD-L1 (diamond) significantly reduced the tumor volume, compared to saline treated mice. The results for the individual mice for each of the treatments is also indicated (FIG. 63B-FIG. 63F).

In addition, the assessment of B-cell activation was performed using the B16F10 melanoma model. Briefly, 1×10⁶ B16F10 melanoma cell were inoculated subcutaneously on the flank of mice, and tumors were allowed to grow for 10 days. Mice were then dosed with (i) saline solution (circle); (ii) 10 mg/kg anti-CD22 (square); (iii) 10 mg/kg CD22-CpG (SB-337) (triangle); or (iv) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD-L1 (diamond) on Days 10, 12, and 14 (FIG. 64A). Anti-CD22 and CD22-CpG were dosed intravenously; anti-PD-L1 (Atezolizumab) was dosed intraperitoneally. The results indicated that CD22-CpG treatment reduced tumor volume (p=0.08). Similarly, treatment with CD22-CpG+anti-PD-L1 significantly reduced tumor volume (p=0.03).

Consistent with the colorectal and melanoma models, mice inoculated with LLC1 Lewis lung cancer cells showed similar results. Mice were inoculated with LLC1 Lewis lung cancer cells and the average tumor volume growth progression of mice was followed. Starting at day 7 the mice were treated with (i) saline solution (circle); (ii) 10 mg/kg CD22-CpG (SB-337) (circle); (iii) 10 mg/kg anti-PD1 (square); (iv) 10 mg/kg CD22-CpG (SB-337)+10 mg/kg anti-PD1 (upward triangle) (v) 10 mg/kg anti-PD-L1 (downward triangle); (vi) 10 mg/kg CD22-CpG+10 mg/kg anti-PD-L1 (diamond) (FIG. 64B). Anti-CD22 and CD22-CpG were dosed intravenously on Days 7, 10, and 13; anti-PD-L1 and anti-PD1 were dosed intraperitoneally on Days 7, 10, and 14. The results showed that mice treated with 10 mg/kg CD22-CpG alone or in combination with 10 mg/kg anti-PD1 (upward triangle) or in combination with 10 mg/kg anti-PD-L1 (diamond) displayed a significant reduction in tumor volume (p=0.023). Taken together, these results indicated that CD22-CpG treatment can reduce LLC1 tumor volume.

Example 20 Efficacy of Targeting CpG to B-Cells or Dendritic Cells

Experiments were performed to compare the efficacy of targeting CpG to B-cells versus targeting CpG to dendritic cells. Using the CT26 colorectal model, as described above, mice were treated intravenously with CpG conjugated to CD22 (CD22-CpG; SB-337) to target B cells, CpG conjugated to DEC205 (DEC205-CpG; SB-419) to target dendritic cells, or saline. Mice were treated with 10 mg/kg of CpG-Ab on days 12, 17, 20, and 24. Tumor volumes were measured and the average volume (FIG. 65A), as well as the individual tumor volumes for each mice (FIG. 65B-65D) are presented. The results reveal that targeting either B-cells or dendritic cells with a CpG-Ab conjugate is able to reduce the tumor volume.

Example 21 CpG-Ab Activity is CD4+ T-Cell Dependent in CT26 Colorectal Model, but not in A20 Lymphoma Model

To investigate the role of T-cells in the mechanism of action for CpG, two mouse models were employed. In the first model, CT26 colorectal cancer cells were used. Briefly, CT26 mouse models were created as described above, and the average tumor volume growth progression of mice was followed after dosing with (i) saline solution (small circle); (ii) CD4 depletion (big circle); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) CD4 depletion+3 mg/kg CD22-CpG (SB-337) (diamond). CD22-CpG was dosed intravenously on Days 10, 13; and 15 (FIG. 66A). CD4 depletion was performed using anti-CD4 antibody (clone GK1.5, 400 ug/dose) injected intraperitoneally on days 10, 13 and 17. The results from this experiment demonstrated that CD4+ T-cell depletion using CD4 antibodies inhibits the CpG-Ab activity in a CT26 colorectal cancer model (FIG. 66A).

In contrast, CpG-Ab activity was not inhibited upon CD4+ T-cell depletion in a A20 lymphoma model. Briefly, the average tumor volume growth progression of mice using an A20 lymphoma model was followed after dosing the mice with (i) saline solution (circle); (ii) CD4 depletion (upward triangle); (iii) 3 mg/kg CD22-CpG (SB-337) (square); or (iv) CD4 depletion+3 mg/kg CD22-CpG (SB-337) (downward triangle) (FIG. 66B). CD22-CpG was dosed intravenously on Days 10, 12; and 14. CD4 depletion was performed using anti-CD4 antibody (clone GK1.5, 400 ug/dose) injected intraperitoneally on days 10, 13 and 17. In this model, CD22-CpG reduced the tumor model, relative to saline. However, CD4 depletion did not affect the CpG-Ab activity.

Example 22 B-Cell CpG-Ab Induces Surface T-Cell Co-Stimulators

The role of T-cell activation in B-cell directed CpG-Ab (SB-1490) was assayed by measuring the expression of surface T-cell co-stimulators on B-cells that were treated with antibody, CpG (p347), or CpG-Ab (SB-337). The mouse spleen was harvested and passed through a 70 micron sieve to generate a single cell suspension. The red blood cells (RBC) were lysed by incubation with RBC lysis buffer for 5 min at room temperature and then quenched with complete media. The B-cells were further isolated by negative selection using a mouse B-cell isolation kit (Miltenyi Biotec). Cells were harvested by gentle centrifugation, washed, and re-suspended at a concentration of 2×10⁶ cells/mL in RPMI containing 10% fetal bovine serum (FBS), and 1% penicillin/streptomycin (PS). Cells were then seeded in 96-well plates, and treated with the test compounds at the indicated concentration (1 nM), and incubated at 37° C. for 72 hours. Cells were then harvested by gentle centrifugation and re-suspended in FACS buffer. After centrifugation again, the cells were then re-suspended in 500 μL FACS buffer. Mouse FcR Blocker was added and incubated for 10 min at room temperature. Cells were transferred to ice and appropriate labeled FACS antibodies (see examples below) were added and incubated on ice for 30 min. Non-specific isotype controls were used. Then, cells were collected in FACS buffer in Eppendorf tubes. Cells were centrifuged, washed once with FACS buffer, and then re-centrifuged. Cells were then re-suspended in 1 mL FACS buffer again, then kept on ice until analysis by CyFlow ML FACS machine. Data was analyzed using Flow Jo software.

The results from the in vitro incubation of mouse spleen B-cells with antibody, free CpG (SB-4715), or CpG-Ab (SB-1490) conjugate revealed that B-cell directed CpG-Ab conjugate induces the surface T-cell co-stimulators, such as CD40, CD70, CD80, CD86, MHC-I, MHC-II, and 4-1 BBL (FIG. 67A).

Similar results were obtained from mice that were treated in vivo. Briefly, mice were treated with 10 mg/kg, three times per week, and CD19+/B220+ B-cells were analyzed 3-days post the final dose. Mouse spleens/lymph nodes were harvested, rinsed with PBS and passed through a 70 micron sieve to generate a single cell suspension. Cells were centrifugated gently and then re-suspended in FACS buffer. FcR Blocker was added (1:20 dilution) and incubated for 10 min at room temperature. Cells were transferred to ice and appropriate labeled FACS antibodies (or non-specific isotype controls) were added and incubated on ice for 30 min. Cells were collected in FACS buffer in Eppendorf tubes. Cells were centrifuged, then washed once with 1 mL FACS buffer, then centrifuged again. Cells were re-suspended in 1 mL FACS buffer again, then kept on ice until analysis by CyFlow ML FACS machine. Data was analyzed using Flow Jo software. Treatment with CpG-Ab resulted in increased surface expression of CD40, CD80, CD86, and MHC-II, relative to saline (FIG. 67B).

Marker Name Isotype Fluorophore CD137L 4-1BBL rat IgG2a PE CD252 OX40L rat IgG2b PE CD274 PD-L1, B7H1 rat IgG2b PE CD275 ICOSL, B7H2 rat IgG2a PE

Example 23 B-Cell CpG-Ab Induces T-Cell Activation in Secondary Lymphoid Tissues

The activation of T-cells in secondary lymphoid tissues was measured by FACS to evaluate the functional effect of B-cell targeted CpG-Ab conjugates. Briefly, Balb/c mice were treated with treated with (i) saline (solid); (ii) 10 mg/kg Ab (anti-CD22) (checkered); (iii) 10 mg/kg CpG-Ab (SB-SB-337) (horizontal); or (iv) an equivalent dose of CpG (p347) (vertical), three times per week. Three days post the last dose the mouse spleen and lymph nodes were harvested, and CD3 T-cells were analyzed by FACS. Mouse spleens/lymph nodes were harvested, rinsed with PBS and passed through a 70 um sieve to generate a single cell suspension. Cells were centrifugated gently and then re-suspended in FACS buffer. FcR Blocker was added (1:20 dilution) and incubated for 10 min at room temperature. Cells were transferred to ice and appropriate labeled FACS antibodies (or non-specific isotype controls) were added and incubated on ice for 30 min. Cells were collected in FACS buffer in Eppendorf tubes. Cells were centrifuged, then washed once with 1 mL FACS buffer, then centrifuged again. Cells were re-suspended in 1 mL FACS buffer again, then kept on ice until analysis by CyFlow ML FACS machine. Data was analyzed using Flow Jo software

Activated T-cells were quantified by measuring the percentage of CD71+, CD3+ cells, relative to the total T-cell population (CD3+) (FIG. 68A). Activated T-cells were also quantified by measuring the amount of Ki67+, CD3+ cells, relative to the total T-cell population (CD3+) (FIG. 68B). The FACS results revealed that the B-cell targeting CpG-Ab conjugate, and, to a lesser extent free CpG, increase the percentage of activated T-cells in secondary lymphoid tissues.

Example 24 Adoptively Transferred Lymph Node Cells Inhibit Tumor Growth

Experiments to further analyze the role of T-cell activation in B-cell targeting CpG-Ab conjugates were performed using the CT-26 mouse colorectal cancer model. The CT-26 mouse colorectal model was created as described above. Tumors were staged on day 10 and mice were dosed intravenously with (i) saline solution (circle); (ii) 10 mg/kg CD22-CpG (SB-337) (square); (iii) 10 mg/kg CD22 (upward triangle); or (iv) free CpG (p347) (downward triangle) on days 10, 12, 14 (FIG. 69A). Tumor growth was monitored for 22 days (32 days from the day of inoculation) (FIG. 69A). In agreement with the other results described above, CD22-CpG resulted in lower tumor volumes, relative to the other treatment groups.

On day 32, the mice were sacrificed and lymph nodes (draining and non-draining) were isolated and pooled from mice in each treatment group. The lymph nodes were passed through a 70 mm sieve to generate a single cell suspension. Cells were washed twice with ice-cold PBS and counted. 1×10⁷ cells (approximately 70% T-cells) were mixed with 0.1×10⁶ CT-26 cells in HBSS buffer, and the mixture was inoculated subcutaneously on the flanks of naive BalbC mice, as per standard protocol. Tumor volume was monitored in these mice for 24 days (FIG. 69B). The results indicated that adoptively transferred lymph node cells inhibit tumor growth (FIG. 69C)

Example 25 B-Cell CpG-Ab Induces Innate Immune Response

The effect of B-cell targeting CpG-Ab conjugates on the innate immune response was analyzed by intravenously treating naïve mice with (i) saline (solid); (ii) 10 mg/kg Ab (CD22) (checkered); (iii) 5.7 ug CpG (p347) (horizontal); or (iv) 10 mg/kg CpG-mAb (SB-337). Blood was collected from the tail at the indicated time points and the serum was isolated by centrifugation. Serum cytokine levels was measured by bead-based multiplex analysis (LEGENDplex, Biolegend).

After treating the mice, multiple plasma cytokines associated with the innate immune response (i.e. IL-6, IL-10, IL-1p, IL-12p70, IFNγ, and TNFα) were measured 1 hr, 6 hr, and 24 hr after treatment (FIG. 70A-70F). The results indicated that B-cell targeting CpG-Ab conjugates induce a favorable cytokine profile for T-cell, dendritic cell (DC), and natural killer (NK) cell activation. Notably, IL-1p3 (FIG. 70C), and IL-12p70 (FIG. 70D) concentrations were highly elevated at 6 hr. Furthermore, it was observed that free CpG strongly increased TNFα (FIG. 70F) plasma concentration levels at 1 hr, whereas this effect was not observed with the CpG-mAb conjugate, suggesting that CpG-mAb can have a safety advantage over free CpG.

Example 26 B-Cell CpG-Ab Induces B-Cell Differentiation and Germinal Center Formation

To assess whether B-cell CpG-Ab induces B-cell differentiation and germinal center formation the CT-26 colorectal cancer model was employed according to the methods described above. Briefly, mice were inoculated with CT-26 colorectal cancer cells, and allowed to grow for 10 days. Mice were then treated intravenously with saline or 10 mg/kg CpG-mAb (SB-1490) on days 10, 13, and 17 and were sacrificed 24 hours after the last dose. The spleens were isolated single cell preparations were prepared as mentioned above and the percentage of B-cells (B220*; FIG. 71A), GC cells (B220⁺, IgD^(lo), Fas⁺; FIG. 71B), and T follicular helper (Tfh) cells (CD4+, CXCR5+, PD-1+; FIG. 71C) relative to the total number of cells in the spleen were determined using FACS analysis. In addition, the relative fold changes of IL-21 (FIG. 71D), Bcl-6 (FIG. 71E), and IRF-4 (FIG. 71F) gene expression were determined using standard qPCR methods. The results demonstrated that CpG-mAb significantly increased the percentage of B-cells, GC cells, and Tfh cells, as well as significantly increased the expression levels of IL-21, Bcl-6, and IRF-4. Taken together, these results demonstrated that B-cell targeting CpG-Ab conjugate induces B-cell differentiation and GC formation.

Example 27 B-Cell CpG-Ab Induces Innate and Adaptive Immune Responses

The effect of B-cell CpG-Ab treatment on the innate and adaptive immune responses was measured using the CT-26 colorectal cancer model. CT-26 colorectal mouse model was created as described above. To assess the innate immune response, tumors were inoculated subcutaneously and grown for ten days. On days 10, 13, and 17 the mice were treated intravenously with saline, or 3 mg/kg of CpG-mAb (SB-337) and were sacrificed 24 hours after the last dose. Cells were isolated from the spleen and lymph nodes, and the gene expression of several genes associated with the innate immune response (i.e. IL-6, IL-10, IL-1β, and TNFα) were measured by qPCR. The results revealed that treatment with the CpG-mAb increased the expression of IL-6, IL-10, and IL-1 in the spleen (FIG. 72A-C) and the draining lymph node (FIG. 73A-C). However, the CpG-mAb did not increase TNFα expression in either the spleen (FIG. 72D) or the draining lymph node (FIG. 73D). Collectively, these results demonstrated that the B-cell targeting CpG-Ab conjugate induces the innate immune response.

Next, the effect of the B-cell CpG-Ab treatment on the adaptive immune response was measuring using the CT-26 solid tumor model. CT-26 colorectal mouse model was created as described above. To assess the adaptive immune response, tumors were inoculated subcutaneously and grown for ten days. On days 10, 13, and 16 the mice were treated intravenously with saline, or 3 mg/kg of CpG-mAb (SB-337) and the mice were sacrificed on day 24, blood was collected by cardiac puncture and serum levels of IgM, IgG and IgG2a were measured by ELISA. Sera was collected from the mice and the levels of IgM, IgG, and IgG2a were measured. For the mice treated with CpG-mAb, IgM (FIG. 74A), IgG (FIG. 74B), IgG2a (FIG. 74C) were all significantly increased, relative to saline treated mice.

The levels of the tumor-specific antibodies were further analyzed by performing an ELISA using the CT-26 tumor antigen AH1 as the substrate. AH1 peptide was coated onto 96-well placets overnight and the wells were then washed three times with ELISA wash buffer to remove excess peptide. Mouse serum samples were added and incubated for 2 hours at room temperature. The wells were then rinsed x3 again and the amount of mouse anti-AH1 IgG2a in the serum was measured using two different commercially available secondary anti-mouse IgG2a-HRP antibodies, 2^(nd) Ab1 and 2^(nd) Ab2 (FIG. 75). The wells were washed again and a TMB substrate solution (100 μL) was added to each well. After the plate was incubated at room temperature for 15-30 minutes or until desired color is developed, a stop solution (100 μL) was added to each well and the plate was read at 450 nm. In agreement with there being more IgG2a in the sera of the mice, treatment with CpG-mAb resulted in significantly more tumor-specific IgG2a in the sera. These results indicated that the B-cell CpG-Ab induces an adaptive response that produces a class switch to high affinity tumor-specific antibodies.

Example 28 B-Cell CpG-Ab Reduces B-Reg Population

The effect of the B-cell targeting CpG-Ab conjugate on splenic B-reg cells was analyzed. Balb/C mice (n=8) were treated with saline or 10 mg/kg of CpG-Ab (SB-337) on days 1, 4 and 7. The mice were sacrificed 14 days after the last dose. The percentage of splenic Breg cells (CD19+, B220+, CD1d^(hi)) was determined, relative to the number of B-cells (B220+) (FIG. 76A). In addition, the percentage of splenic B-reg cells (CD19+, B220+, CD1d^(hi)) was determined, relative to the total number of cells (FIG. 76B). Quantification of the percentage of B-reg cells under both parameters revealed that CpG-mAb treatment significantly reduced the B-reg population in the mice, relative to saline treatment (FIG. 76A and FIG. 76B). These results demonstrated that B-cell CpG-Ab reduces the B-reg population.

Example 29 B-Cell CpG-Ab Expands DC Population in Secondary Lymphoid Tissues

To assess the effect of B-cell targeted CpG-Ab treatment on the dendritic cell population in secondary lymphoid tissues the CT-26 solid tumor model was used. Mice were treated intravenously with saline, 5.7 ug/dose CpG (p347), or 10 mg/kg CpG-mAb (SB-337) on days 14, 17, 20. Cells from the spleens were isolated as described above. The percentage of spleen myeloid dendritic cells (mDC; B220-, CD11C+, DEC205^(hi)) was calculated, relative to the total number of cells. Quantification of the spleen mDC percentage revealed that both free CpG and the CpG-mAb treatment significantly increased the percentage of mDC cells, relative to saline treatment (p=0.003; p=0.0002, respectively) (FIG. 77A). Furthermore, the percentage of mDC cells after CpG-Ab treatment was significantly increased relative to the free CpG (p=0.002) (FIG. 77A). Taken together, these results demonstrated that CpG-Ab treatment expands the mDC pool in the spleen.

In addition, the percentage of pooled lymph node mDC cells (B220-, CD11C+, CD8+) were determined. Treatment of mice with CpG-mAb resulted in an increased percentage of LN mDCs, in both the draining lymph node (dLN), and the non-draining lymph node (ndLN) (FIG. 77B). However, the effect was not observed upon treatment with free CpG (FIG. 77B), which highlights the differential effect between the CpG-Ab conjugate and free CpG. The results indicated that B-cell targeting CpG-Ab conjugates can expand the dendritic cell population in both the spleen, and the lymph nodes.

Example 30 pDCs Contribute to CpG-Ab Activity

Experiments using the CT26 colorectal cancer model and the A20 lymphoma model were performed to determine the contribution of plasmacytoid dendritic cells (pDCs) on CpG-Ab activity. In the CT-26 colorectal model, tumors were grown for 10 days, and then mice were treated intravenously with saline, or 3 mg/kg CD22-CpG (SB-337) on days 10, 13, and 15. In addition, some mice were intraperitoneally injected with PDCA1 antibody, clone BX444, (300 μg per mouse), alone or in combination with CD22-CpG (SB-337) on days 10, 13, and 17 to deplete the pDC cells. The tumor volume progression was measured, and the results indicated that pDC depletion decreased the efficacy of CD22-CpG in the CT-26 colorectal model (FIG. 78A).

The A20 lymphoma model yielded similar results. A20 lymphoma tumors were grown for 10 days and then mice were treated intravenously with saline, or 3 mg/kg CD22-CpG (SB-337) on days 10, 12, and 14. In addition, some mice were intraperitoneally injected with PDCA1 antibody, clone BX444, (300 μg per mouse), alone or in combination with CD22-CpG (SB-337) on days 10, 13, and 17 to deplete the pDC cells. The tumor volume progression was measured, and the results indicated that pDC depletion decreased the efficacy of CD22-CpG in the A20 lymphoma model (FIG. 78B). Taken together, the results demonstrated that pDCs contribute to CpG-Ab activity.

Example 31 CpG-mAb Increased T-Cell Tumor Infiltrates

The effect of CpG-mAb conjugates on T-Cell Infiltrates was determined using the A20 lymphoma model. Briefly, A20 cells were subcutaneously inoculated into mice, and on days 10, 13, and 17 the mice were intravenously treated with saline or 3 mg/kg of CpG-mAb (SB-337) and animals were sacrificed 24 hours after the last dose. In some experiments, the mice were also treated with 10 mg/kg anti-PD-L1 (FIG. 79D). Tumors from the mice were removed, homogenized at 4° C., mRNA was extracted by standard methods and gene expression analysis was performed by qPCR for T-Cell Genes, such as CD3, CD4, CD8a, and CD8b (FIG. 79A; macrophage Genes, such as CD38, GPR18, iNOS, FPR2, Egr2, Arg1, CD206, Adgre1, CD68, and Cd11b (FIG. 79B); cytokine genes, such as IL-2, IL-4, IL-6, IL-10, IL-13, IL-21, TNFα, IFNγ, and TGFβ (FIG. 79C); and apoptotic enzyme genes, such as granzyme B, and perforin (FIG. 79D). Analysis of the gene expression, relative to peptidylpropyl isomerase B (PPIB) was determined. The results indicated that CpG-mAb increased the expression of T-Cell genes (FIG. 79A), macrophage genes (FIG. 79B), and certain cytokine genes (FIG. 79C). In addition, CpG-mAb and CpG-mAb+ anti-PD-L1 both increased the expression of apoptotic enzyme genes (FIG. 79D). Collectively, the tumor gene expression profile for the mice treated with CpG-mAb was consistent with the presence and/or activation of immune cells.

Example 32 Human CpG-Ab Activity Confirmed

The effect of CpG-Ab conjugates on primary human B-cells was evaluated by collecting and pooling peripheral blood mononuclear cells (PBMCs) from three donors. Briefly, leukocyte enriched blood (LRS chambers) were obtained from the San Diego Blood Bank. Leukocytes were isolated by standard Ficoll gradient centrifugation protocol. B-cells were further isolated by negative selection using a B-cell Isolation Kit (Miltenyi). B-cells (>95% pure) were re-suspended in RPMI containing 10% FBS and 1% PS and seeded in 96-well plates (1×10⁵ cells/well). Cells were treated with CpG (p425), CpG-Ab (SB-430), or Ab (hCD22), as indicated, at a range of concentrations and incubated at 37° C. for 48-72 hr.

Following treatment, the culture media was removed and secreted IL-6 levels were measured by ELISA (FIG. 80A). Cells were then harvested and cell surface markers for MHC-II (FIG. 80B), CD86 (FIG. 80C), CD70 (FIG. 80D), and CD20 (FIG. 80E) were measured by FACS. The results indicated that human primary B-cells were more sensitive to CpG-Ab treatment, as determined by the concentration of secreted IL-6 (FIG. 80A), and surface markers for MHC-II (FIG. 80B), CD86 (FIG. 80C), CD70 (FIG. 80D), and CD20 (FIG. 80E).

In addition, human primary splenocytes were analyzed for response to treatment with CpG-Ab conjugates and free CpG. Primary human splenocytes were purchased from Bioreclamation IVT. Cells were re-suspended in RPMI containing 10% FBS and 1% PS (2×10⁶ cells/ml) and seeded in 96-well plates. Cells were treated with hCD22-hCpG (SB-430), free human CpG p1, or free human CpG (Solstice; p425) at the indicated concentrations and incubated at 37° C. for 24 hrs. The culture media was removed and secreted IL-6 was measured by ELISA. Treatment with hCD22-hCpG was able to increase the concentration of IL-6 at lower doses than free CpG p1 or free human CpG (solstice; p425) (FIG. 81). The EC₅₀ values were 0.51 nM, 818 nM, and 338 nM, respectively, which provided further evidence that hCpG-hAb could activate human splenocytes.

Experiments were conducted using a humanized mouse model in NCG mice. This model was created by sequential CRISPR/Cas9 editing of the Prkdc and II2rg loci in the NOD/Nju mouse, generating a mouse coisogenic to the NOD/Nju. The NOD/Nju carries a mutation in the Sirpa (SIRP a) gene that allows for engrafting of foreign hematopoietic stem cells. The Prkdc knockout generates a SCID-like phenotype lacking proper T-cell and B-cell formation. The knockout of the II2rggene further exacerbates the SCID-like phenotype while additionally resulting in a decrease of NK cell production. The mice were first treated intraperitoneally with fresh human PBMC and then challenged with subcutaneous injection of Daudi cells (2.5×10⁶) two days later (FIG. 82A). On days 12, 14, and 16 the mice were treated with saline, 5 mg/kg hCD22 antibody, 5 mg/kg hCD22-CpG (SB-430), or 5.7 μg/dose of free CpG (p425). The average tumor volume was followed for 32 days (FIG. 82B). The results indicated that the mice treated with hCD22-CpG has smaller tumor volumes, relative to the other treatment groups. Collectively, these results indicated that CpG-Ab conjugates are efficacious in human cells.

Example 33

To demonstrate and compare efficacy of the CpG-containing polynucleotide according to the present disclosure with naturally existing CpG sequences, NFxB activity in human Ramos cells was measured after the cells were incubated with the present CpG-containing polynucleotide either in the free-standing form or in the conjugated form, and with a naturally existing class B CpG sequence either in the free-standing form or in the conjugated form. As shown in FIG. 58B, the present CpG-Ab conjugate had significantly improved activity as compared to the free-standing or conjugated class B CpG.

Example 34

To evaluate whether the CpG-containing polynucleotide according to the present disclosure activates the complement pathway, C3 release was assessed by incubating monkey serum with zymosan (positive control), naturally existing class B CpG sequence (p1), or two CpG-containing polynucleotides as provided herein. As shown in FIG. 59, the CpG-containing immunostimulating polynucleotide provided herein did not activate the complement pathway.

Example 35: Biological Activity of CpG-Antibody Conjugates Using Mouse Splenocyte Assay

Mouse (BALB/c) spleen was harvested and passed through a 70 μm sieve to generate a single cell suspension. Red blood cells were lysed by incubation with RBC lysis buffer for 5 min at room temperature and then quenched with 20:1 complete media. Cells were harvested by gentle centrifugation, washed, and resuspended in RPMI containing 10% FBS and 1% PS (2×106 cells/mL) and seeded in 9well plates. Test compounds were added at the indicated concentrations and incubated at 37° C. for 24 hours. The culture media were removed and secreted IL-6 was measured by ELISA. The results are summarized in the table below.

P18 P347 SB-337 DAR1 SB-337 DAR2 EC₅₀ (nM) 42 219 0.07 0.11

Example 36: Pharmokinetic Studies of CpG-Antibody Conjugates

For a single dosing experiment, a test compound was administered to (BALB/c) mice at 10 mg/kg IV or SC. Serum samples were collected at predetermined time points for analysis and the results are shown in FIG. 83.

For a repeat dosing experiment, a test compound was administered to mice at 10 mg/kg IV on days 1, 7, and 14. Serum samples were collected on day 14 after the last injection at predetermined time points for analysis and the PK profile was compared to another set of mice that received only a single dose of the test compound. The results are shown in FIG. 84.

In another single dosing experiment, a CpG-antibody conjugate was administered to mice at 10 mg/kg IV. Serum samples were collected at 0.08, 1, 6, 24, 48, and 120 hours after administration. The serum samples were analyzed by both antibody and intact CpG-antibody conjugate. The results are shown in FIG. 85.

In yet another single dosing experiment, CpG-antibody conjugates were administered to mice at 10 mg/kg IV. Mice were sacrificed at 0, 0.08, 1, 6, and 24 hours post injection. Serum, liver, and spleen samples were analyzed. The results are shown in FIG. 86.

In yet another single dosing experiment, CpG-antibody conjugates were administered to mice at 10 mg/kg IV. Serum samples were collected at predetermined time points and the results are shown in FIGS. 87A and 87B.

In the above pharmaceutical experiments, the serum samples were analyzed using ELISA assays. To determine the amount of an intact CpG-antibody conjugate remained, serum samples were diluted with a biotinylated-CpG complementary sequence using an ELISA blocking buffer and then incubated for 30 minutes at room temperature. The diluted serum samples were each added at 100 μL to a well in a 96-well plate pre-coated with streptavidin. After the plate was incubated at room temperature for 60 minutes on a plate shaker and washed 3 times with an ELISA wash buffer, a goat anti-mouse IgG-HRP antibody (100 μL) at an optimized dilution in the ELISA blocking buffer was added to each well. After the plate was incubated at room temperature for 30 minutes on a plate shaker and washed 3 times with the ELISA wash buffer, a TMB substrate solution (100 μL) was added to each well. The plate was incubated at room temperature for 15-30 minutes or until desired color is developed, and a stop solution (100 μL) was then added to each well. The plate was read at 450 nm. Intact CpG-antibody conjugate concentrations in serum were calculated using a standard curve starting at 50 nM and serially diluted in the ELISA blocking buffer. The same protocol was also used to determine CpG-antibody conjugates in tissues after the tissues were homogenized.

To analyze for an antibody or the antibody portion of a CpG-antibody conjugate, a 96-well plate was coated with a mouse CD22 extracellular domain diluted in PBS. The plate was incubated at 4° C. overnight, washed 3 times with the ELISA wash buffer, and blocked with the ELISA blocking buffer for at least 60 minutes at room temperature. Serum samples were diluted with an optimized dilution factor in the ELISA blocking buffer. The diluted serum samples were each added at 100 μL to a well in the 96-well plate. After the plate was incubated at room temperature for 60 minutes on a plate shaker and washed 3 times with the ELISA wash buffer, a goat anti-mouse IgG-HRP antibody (100 μL) at an optimized dilution in the ELISA blocking buffer was added to each well of the plate. After the plate was incubated at room temperature for 30 minutes on a plate shaker and washed 3 times with the ELISA wash buffer, a TMB substrate solution (100 μL) was added to each well. After the plate was incubated at room temperature for 15-30 minutes or until desired color is developed, a stop solution (100 μL) was added to each well. The plate was read at 450 nm. CD22 antibody concentrations in serum were calculated using a standard curve starting at 50 nM and serially diluted in the ELISA blocking buffer.

OTHER EMBODIMENTS

Various modifications and variations of the described invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention that are obvious to those skilled in the art are intended to be within the scope of the invention.

Other embodiments are in the claims. 

What is claimed is:
 1. An oligonucleotide of Formula (A): X^(5′)—(X^(N))_(b)—Y^(P)—(X^(N))_(c)—X^(3′)  (A) or a stereoisomer, a mixture of two or more diastereomers, a tautomer, or a mixture of two or more tautomers thereof; or a pharmaceutically acceptable salt, solvate, or hydrate thereof; wherein: each X^(N) is independently a nucleotide; X^(3′) is a 3′ terminal nucleotide; X^(5′) is a 5′ terminal nucleotide; Y^(P) is an internucleoside phosphotriester; and b and c are each an integer ranging from about 0 to about 25; with the proviso that their sum is no less than 5; wherein the oligonucleotide comprises a nucleotide with a modified nucleobase.
 2. An oligonucleotide having a sequence of N¹N²CGN³CG(T)_(x)GN⁴CGN⁵T (SEQ ID NO:497), wherein: x is an integer ranging from 1 to 4; N¹ is absent or 2′-deoxythymidine; N² is a 2′-deoxyribonucleotide with a modified nucleobase; N³ is T-deoxyadenosine or 2′-deoxythymidine, each optionally comprising a 3′-phosphotriester; N⁴ is T-deoxyadenosine or 2′-deoxythymidine; and N⁵ is 2′-deoxythymidine optionally comprising a 3′-phosphotriester.
 3. A method of treating cancer in a subject having cancer, comprising administering to the subject a therapeutically effective amount of the oligonucleotide of claim
 1. 4. A method of modulating an endosomal toll-like receptor in a cell comprising the endosomal toll-like receptor, the method comprising contacting the cell with the oligonucleotide of claim 1, under conditions permitting the immunomodulating polynucleotides to be transported into the cell, wherein, after the contacting, the activity of the endosomal toll-like receptor is modulated.
 5. A method of inducing one or more cytokines in an antigen-presenting cell comprising an endosomal toll-like receptor, the method comprising contacting the antigen-presenting cell with the oligonucleotide of claim 1 under conditions permitting the one or more immunomodulating polynucleotides to be transported into the cell, wherein, after the contacting, the level of at least one cytokine in the cell is increased, wherein the targeting moiety targets the antigen-presenting cell; and wherein the immunomodulating polynucleotide is an immunostimulating polynucleotide.
 6. The oligonucleotide of claim 1, wherein b is an integer ranging from about 1 to about
 15. 7. The oligonucleotide of claim 1, wherein b is an integer of about 2, about 3, about 4, about 11, or about
 14. 8. The oligonucleotide of claim 1, wherein c is an integer ranging from about 0 to about
 10. 9. The oligonucleotide of claim 1, wherein c is an integer of about 0 or about
 8. 10. The oligonucleotide of claim 1, wherein the sum of b and c is ranging from about 5 to about
 20. 11. The oligonucleotide of claim 1, wherein the sum of b and c is about 8, about 9, about 10, about 11, about 12, about 13, or about
 14. 12. The oligonucleotide of claim 1, wherein each X^(N) is independently a 2′-deoxyribonucleotide.
 13. The oligonucleotide of claim 1, wherein X^(3′) is a 2′-deoxyribonucleotide.
 14. The oligonucleotide of claim 1, wherein X^(3′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 2′-deoxycytidine, a 5-halo-2′-deoxycytidine, T-deoxythymidine, 2′-deoxyuridine, or a 5-halo-2′-deoxyuridine.
 15. The oligonucleotide of claim 1, wherein X^(3′) is 2′-deoxythymidine.
 16. The oligonucleotide of claim 1, wherein X^(3′) is a 2′-modified ribonucleotide.
 17. The oligonucleotide of claim 1, wherein X^(3′) is a 2′-methoxy ribonucleotide or 2′-ethoxymethoxy ribonucleotide.
 18. The oligonucleotide of claim 1, wherein X^(5′) is a 2′-deoxyribonucleotide.
 19. The oligonucleotide of claim 1, wherein X^(5′) is 2′-deoxyadenosine, 2′-deoxyguanosine, 2′-deoxycytidine, a 5-halo-2′-deoxycytidine, T-deoxythymidine, 2′-deoxyuridine, or a 5-halo-2′-deoxyuridine.
 20. The oligonucleotide of claim 1, wherein X^(5′) is a 2′-deoxyribonucleotide with a substituted pyrimidine base.
 21. The oligonucleotide of claim 1, wherein X^(5′) is a 2′-deoxyribonucleotide with a 5-substituted pyrimidine base.
 22. The oligonucleotide of claim 1, wherein X^(5′) is 2′-deoxythymidine, a 5-halo-2′-deoxycytidine, or a 5-halo-2′-deoxyuridine.
 23. The oligonucleotide of claim 1, wherein X^(5′) is a 5-halo-2′-deoxycytidine.
 24. The oligonucleotide of claim 1, wherein X^(5′) is a 5-halo-2′-deoxyuridine.
 25. The oligonucleotide of claim 1, wherein X^(5′) is 2′-deoxythymidine, 5-bromo-2′-deoxycytidine, 5-iodo-2′-deoxycytidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine.
 26. The oligonucleotide of claim 1, wherein X^(5′) is 2′-deoxythymidine, 5-bromo-2′-deoxyuridine, or 5-iodo-2′-deoxyuridine.
 27. The oligonucleotide of claim 1, wherein X^(5′) has a 3′-phosphorothioate group.
 28. The oligonucleotide of claim 27, wherein the 3′-phosphorothioate is chiral.
 29. The oligonucleotide of claim 28, wherein X^(5′) has a 3′-phosphorothioate group having a chirality of Rp and X^(3′) is a 2′-methoxy ribonucleotide or 2′-ethoxymethoxy ribonucleotide.
 30. The oligonucleotide of claim 28, wherein X^(5′) has a 3′-phosphorothioate group having a chirality of Sp and X^(3′) is a 2′-methoxy ribonucleotide or 2′-ethoxymethoxy ribonucleotide.
 31. The oligonucleotide of claim 1, wherein Y^(P) is:

wherein Z is O or S; and d is an integer ranging from about 0 to about
 50. 32. The oligonucleotide of claim 1, wherein Y^(P) is:

wherein Z is O or S; and d is an integer ranging from about 0 to about
 50. 33. The oligonucleotide of claim 1, comprising an additional internucleoside phosphotriester.
 34. The oligonucleotide of claim 33, wherein the additional internucleoside phosphotriester is an alkylphosphotriester.
 35. The oligonucleotide of claim 1, comprising one or more internucleoside phosphorothioates. 